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A156514 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 51. 0
5, 116, 452, 60568, 662388, 382580208, 13757627936, 22555562198752 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..10.

CROSSREFS

Sequence in context: A245105 A080988 A230338 * A319392 A268606 A006221

Adjacent sequences:  A156511 A156512 A156513 * A156515 A156516 A156517

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified April 8 03:01 EDT 2020. Contains 333312 sequences. (Running on oeis4.)