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A156510 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 49. 0
1, 2, 10, 198, 10918, 2335392, 1569913286, 14728525914260, 599617717929388908 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Sequence in context: A194971 A155200 A264563 * A246532 A159558 A297066

Adjacent sequences:  A156507 A156508 A156509 * A156511 A156512 A156513

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified May 6 01:03 EDT 2021. Contains 343579 sequences. (Running on oeis4.)