• strict warning: Non-static method view::load() should not be called statically in /home/grom/grom.zeminvaders.net/sites/all/modules/views/views.module on line 906.
  • strict warning: Declaration of views_handler_filter::options_validate() should be compatible with views_handler::options_validate($form, &$form_state) in /home/grom/grom.zeminvaders.net/sites/all/modules/views/handlers/views_handler_filter.inc on line 607.
  • strict warning: Declaration of views_handler_filter::options_submit() should be compatible with views_handler::options_submit($form, &$form_state) in /home/grom/grom.zeminvaders.net/sites/all/modules/views/handlers/views_handler_filter.inc on line 607.
  • strict warning: Declaration of views_handler_filter_boolean_operator::value_validate() should be compatible with views_handler_filter::value_validate($form, &$form_state) in /home/grom/grom.zeminvaders.net/sites/all/modules/views/handlers/views_handler_filter_boolean_operator.inc on line 159.
  • strict warning: Declaration of views_plugin_style_default::options() should be compatible with views_object::options() in /home/grom/grom.zeminvaders.net/sites/all/modules/views/plugins/views_plugin_style_default.inc on line 24.
  • strict warning: Declaration of views_plugin_row::options_validate() should be compatible with views_plugin::options_validate(&$form, &$form_state) in /home/grom/grom.zeminvaders.net/sites/all/modules/views/plugins/views_plugin_row.inc on line 134.
  • strict warning: Declaration of views_plugin_row::options_submit() should be compatible with views_plugin::options_submit(&$form, &$form_state) in /home/grom/grom.zeminvaders.net/sites/all/modules/views/plugins/views_plugin_row.inc on line 134.

Project Euler - Problem 15

Today I came across Problem 15 from Project Euler,

Starting in the top left corner of a 2x2 grid, there are 6 routes (without backtracking) to the bottom right corner.
Routes for 2x2 grid
How many routes are there through a 20x20 grid?