A156468 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 18.

1, 8, 114, 3704, 285470, 46859304, 17604991124, 15033533213232, 35207864619957092

Offset

2,2

Links

Table of n, a(n) for n=2..10.

Crossrefs

Sequence in context: A220635 A113670 A347019 * A293992 A220575 A240890

Adjacent sequences: A156465 A156466 A156467 * A156469 A156470 A156471

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved