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A172894
Number of n X n 0..6 arrays with row sums 6 and column sums 6.
4
1, 1, 7, 406, 132724, 164176640, 602351808741, 5562418293759978, 114601242382721619224, 4801114002903931560293544, 379957050243738294456427057200, 53499490664883668314419655562118240
OFFSET
0,3
LINKS
CROSSREFS
Column k=6 of A257493.
Sequence in context: A160292 A215562 A099125 * A286393 A099742 A287033
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 06 2010
STATUS
approved