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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
OFFSET
1,3
LINKS
CROSSREFS
Sequence in context: A276513 A167063 A115485 * A001167 A250066 A299035
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2010
STATUS
approved