A156447 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 8.

1, 0, 2, 2, 24, 60, 1483, 10236, 175765, 2771020, 133072650, 2511725250, 142353126510, 4354347220860, 366766557522330, 16657062087640520

Offset

2,3

Links

Table of n, a(n) for n=2..17.

Crossrefs

Sequence in context: A226979 A261517 A131448 * A272641 A334123 A127261

Adjacent sequences: A156444 A156445 A156446 * A156448 A156449 A156450

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved