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A156483 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 25. 0
1, 4, 4, 58, 112, 5024, 18704, 5884232, 62428100, 91955846752, 2206580129292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

Sequence in context: A322099 A009644 A196180 * A212328 A214615 A206489

Adjacent sequences:  A156480 A156481 A156482 * A156484 A156485 A156486

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified November 22 08:46 EST 2019. Contains 329389 sequences. (Running on oeis4.)