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Search: id:A156458
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A156458 Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 13. +0
1
2, 6, 68, 876, 43300, 3026820, 558858552, 474109634808, 1011861877473980, 3520221010293816000 (list; graph; listen)
OFFSET

2,1
CROSSREFS

Sequence in context: A091458 A087331 A097419 this_sequence A136268 A030242 A037293

Adjacent sequences: A156455 A156456 A156457 this_sequence A156459 A156460 A156461

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Feb 09 2009

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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