A156518 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 61.

2, 12, 326, 16298, 5919644, 9055603332, 108964188487952, 6758216414353306068

Offset

2,1

Links

Table of n, a(n) for n=2..9.

Crossrefs

Sequence in context: A094047 A300045 A091472 * A012727 A296622 A325756

Adjacent sequences: A156515 A156516 A156517 * A156519 A156520 A156521

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved