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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 9 06:30 EDT 2021. Contains 343692 sequences. (Running on oeis4.)