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A156523 Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 68. 0
2, 2, 80, 404, 63392, 1572582, 1619260788, 75946691122 (list; graph; refs; listen; history; internal format)
OFFSET

2,1

CROSSREFS

Sequence in context: A187024 A028372 A130678 * A191779 A156511 A166996

Adjacent sequences:  A156520 A156521 A156522 * A156524 A156525 A156526

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Feb 09 2009

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Last modified February 16 06:46 EST 2012. Contains 205867 sequences.