A156443 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 7.

10, 240, 12160, 804511, 81439488, 10953612400, 2077266004944, 566459875724280, 241889456638665264

Offset

4,1

Links

Table of n, a(n) for n=4..12.

Crossrefs

Sequence in context: A067423 A221099 A171204 * A211088 A064757 A087435

Adjacent sequences: A156440 A156441 A156442 * A156444 A156445 A156446

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved