A156487 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 27.

3, 58, 204, 13400, 102762, 19311868, 365142544, 166203280736, 6303614816380

Offset

3,1

Links

Table of n, a(n) for n=3..11.

Crossrefs

Sequence in context: A037107 A335293 A041735 * A254653 A243510 A024218

Adjacent sequences: A156484 A156485 A156486 * A156488 A156489 A156490

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved