A156445 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 8.

1, 4, 18, 138, 3910, 446508, 89959563, 25250999564, 10095521906313, 5572579847718200, 4311704697906480578

Offset

2,2

Links

Table of n, a(n) for n=2..12.

Crossrefs

Sequence in context: A371038 A065857 A214647 * A304997 A382813 A370774

Adjacent sequences: A156442 A156443 A156444 * A156446 A156447 A156448

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved