OFFSET
2,1
LINKS
Kjell Fredrik Pettersen (after work by Ed Russell), There are 4743933602050718 essentially different Sudoku 2x5 grids. In A. F. Jarvis, Sudoku enumeration problems, 2008.
Ed Russell, There are 1673187 essentially different Sudoku 2x4 grids. In A. F. Jarvis, Sudoku enumeration problems, 2008.
Ed Russell and Frazer Jarvis, There are 49 essentially different Sudoku 2x3 grids, 2008.
Jordy Vanpoucke, Mutually orthogonal latin squares and their generalizations
Wikipedia, Mathematics of Sudoku
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Seiichi Manyama, Aug 19 2017
STATUS
approved