A156425 Number of 17 X 17 arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to n.

1, 1680, 0, 0, 320743643010, 10058239033920, 0, 0, 16657062087640520, 62993444371397120, 0, 0

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Crossrefs

Sequence in context: A339960 A252442 A159625 * A247853 A093787 A258920

Adjacent sequences: A156422 A156423 A156424 * A156426 A156427 A156428

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved