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A156487 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 27. 0
3, 58, 204, 13400, 102762, 19311868, 365142544, 166203280736, 6303614816380 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..11.

CROSSREFS

Sequence in context: A198915 A037107 A041735 * A254653 A243510 A024218

Adjacent sequences:  A156484 A156485 A156486 * A156488 A156489 A156490

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)