A156464 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 16.

1, 2, 2, 7, 19, 1430, 9131, 1559914, 17481322, 4701559354, 99812199364, 42194032310078

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Crossrefs

Sequence in context: A243022 A049955 A184714 * A156520 A307426 A343577

Adjacent sequences: A156461 A156462 A156463 * A156465 A156466 A156467

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved