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A172667 Number of 3*n X n 0..2 arrays with row sums 5 and column sums 15 1
0, 0, 1680, 1252634243520, 15966070888767791932191, 2333327772435239191435579651896000, 2927463235524353975393755326111103021707295200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

R. H. Hardin, Table of n, a(n) for n=1..14

CROSSREFS

Sequence in context: A172568 A172673 A172768 * A221204 A145292 A228183

Adjacent sequences:  A172664 A172665 A172666 * A172668 A172669 A172670

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2010

STATUS

approved

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Last modified September 20 23:04 EDT 2021. Contains 347596 sequences. (Running on oeis4.)