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A172669 Number of 3*n X n 0..2 arrays with row sums 3 and column sums 9 1
0, 20, 1376095, 1252634243520, 8432855707512236000, 297155971199028097720850000, 42758542523186088601256526892620000, 20877662827076969301744211245461828236480000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n=1..23

CROSSREFS

Sequence in context: A078354 A203306 A211489 * A056104 A051117 A180725

Adjacent sequences:  A172666 A172667 A172668 * A172670 A172671 A172672

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2010

STATUS

approved

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Last modified February 21 23:29 EST 2019. Contains 320381 sequences. (Running on oeis4.)