A156440 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 6.

4, 42, 552, 13751, 425674, 18458342, 1164072896, 139921844820, 38221283215416, 19223028387830564, 13952451706754445456

Offset

3,1

Links

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

Crossrefs

Sequence in context: A370282 A268542 A249928 * A151453 A234507 A153854

Adjacent sequences: A156437 A156438 A156439 * A156441 A156442 A156443

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved