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A156526 Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 81. +0
1
1, 2, 8, 184, 772, 77184, 641136, 2194362732 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A105232 A009713 A009377 this_sequence A009505 A028368 A056990

Adjacent sequences: A156523 A156524 A156525 this_sequence A156527 A156528 A156529

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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