A156520 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 64.

1, 2, 2, 7, 19, 50198, 788009, 1184902962, 55064648562

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Crossrefs

Sequence in context: A049955 A184714 A156464 * A307426 A343577 A342644

Adjacent sequences: A156517 A156518 A156519 * A156521 A156522 A156523

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved