A156521 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 64.

1, 0, 0, 3, 7, 132, 3039, 751770, 20902434, 14753635250

Offset

1,4

Links

Table of n, a(n) for n=1..10.

Crossrefs

Sequence in context: A182330 A005844 A347515 * A378832 A012636 A006031

Adjacent sequences: A156518 A156519 A156520 * A156522 A156523 A156524

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved