A156421 Number of 16 X 16 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

1, 32400, 86549820, 39027027088, 4596517872930, 182963339479264, 3086652618464548, 31157969676392800, 303255697073306250, 2788382742936560544

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Crossrefs

Sequence in context: A378984 A190471 A236994 * A156423 A236656 A031639

Adjacent sequences: A156418 A156419 A156420 * A156422 A156423 A156424

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved