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A156475 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 21. 0
6, 130, 1872, 121382, 17647254, 18669753424, 68782403549580, 503051985491086584 (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: A338709 A318528 A095695 * A000907 A188718 A077031

Adjacent sequences:  A156472 A156473 A156474 * A156476 A156477 A156478

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified May 8 13:26 EDT 2021. Contains 343666 sequences. (Running on oeis4.)