A156412 Number of 13 X 13 arrays of squares of integers, symmetric about main diagonal, with all rows summing to n.

1, 568504, 23041655136, 64008728200384, 20331541618406216, 1051966701961097184, 13952451706754445456

Offset

0,2

Links

Table of n, a(n) for n=0..6.

Crossrefs

Sequence in context: A273236 A237935 A237693 * A068724 A233651 A288085

Adjacent sequences: A156409 A156410 A156411 * A156413 A156414 A156415

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved