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A156440 Number of nXn 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: A085954 A046719 A092800 * 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 November 21 02:30 EST 2014. Contains 249767 sequences.