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A156440 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 6. 0
4, 42, 552, 13751, 425674, 18458342, 1164072896, 139921844820, 38221283215416, 19223028387830564, 13952451706754445456 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..13.

CROSSREFS

Sequence in context: A092800 A268542 A249928 * A151453 A234507 A153854

Adjacent sequences:  A156437 A156438 A156439 * A156441 A156442 A156443

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified December 3 03:54 EST 2016. Contains 278698 sequences.