A156511 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 49.

1, 2, 2, 82, 210, 24604, 157700, 153363108, 4197081428, 19984585910224

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Crossrefs

Sequence in context: A303569 A156523 A191779 * A166996 A133295 A055470

Adjacent sequences: A156508 A156509 A156510 * A156512 A156513 A156514

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved