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Search: id:A156435
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A156435 Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 4. +0
1
1, 2, 2, 7, 13, 110, 440, 7010, 34814, 709332, 4108632, 100368324, 667960824, 18944759304, 142719383676, 4596517872930, 38710991748930, 1392671800456580, 12976446818207108, 514918876680042334, 5262123025959154234 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A047767 A019144 A049953 this_sequence A162460 A061274 A061575

Adjacent sequences: A156432 A156433 A156434 this_sequence A156436 A156437 A156438

KEYWORD

nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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