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A291187 Number of 2 X n Sudoku grids ((2*n) X (2*n) grids divided into 2 X n boxes). 1
288, 28200960, 29136487207403520, 1903816047972624930994913280000 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..5.

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

Cf. A107739, A291188.

Sequence in context: A047805 A173150 A282332 * A296608 A272164 A107739

Adjacent sequences:  A291184 A291185 A291186 * A291188 A291189 A291190

KEYWORD

nonn,more

AUTHOR

Seiichi Manyama, Aug 19 2017

STATUS

approved

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Last modified January 22 18:53 EST 2019. Contains 319365 sequences. (Running on oeis4.)