A156406 Number of 11 X 11 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

1, 312, 26820, 424980, 4108632, 10491480, 36058540, 69492920, 448032730, 378230514, 1435365144, 3867308971, 10607876660, 16504055920, 18737188768, 31390349120, 99812199364, 71763897760, 163052061000, 338077231956

Offset

0,2

Links

Table of n, a(n) for n=0..19.

Crossrefs

Sequence in context: A296527 A107508 A015704 * A283492 A112729 A308837

Adjacent sequences: A156403 A156404 A156405 * A156407 A156408 A156409

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved