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A172748
Number of n X n 0..3 arrays with row sums 2*n and column sums 2*n
0
1, 3, 55, 8515, 13130451, 210668680701, 36012988082548233, 68307608848277646753795, 1469748355306450464225368161315, 364459290339560650671344361875961740353
OFFSET
1,2
CROSSREFS
Sequence in context: A297965 A002818 A119190 * A172822 A172873 A172907
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2010
STATUS
approved