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A172724 Number of n X n 0..3 arrays with row sums 7 and column sums 7 1
0, 0, 21, 20112, 84202220, 1070625363840, 36012988082548233, 2867622077261705078784, 494207026605606690167323392, 171330275896315127362166522313600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

R. H. Hardin, Table of n, a(n) for n=1..21

CROSSREFS

Sequence in context: A276513 A167063 A115485 * A001167 A250066 A299035

Adjacent sequences:  A172721 A172722 A172723 * A172725 A172726 A172727

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2010

STATUS

approved

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Last modified September 21 13:37 EDT 2019. Contains 327253 sequences. (Running on oeis4.)