A172748 Number of n X n 0..3 arrays with row sums 2*n and column sums 2*n

1, 3, 55, 8515, 13130451, 210668680701, 36012988082548233, 68307608848277646753795, 1469748355306450464225368161315, 364459290339560650671344361875961740353

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Crossrefs

Sequence in context: A297965 A002818 A119190 * A172822 A172873 A172907

Adjacent sequences: A172745 A172746 A172747 * A172749 A172750 A172751

Keyword

nonn

Author

R. H. Hardin Feb 06 2010

Status

approved