A156498 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 36.

1, 2, 4, 51, 275, 16008, 175374, 67060718, 1866384501, 2036398653264

Offset

1,2

Links

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

Crossrefs

Sequence in context: A303382 A303443 A277034 * A211169 A085325 A082661

Adjacent sequences: A156495 A156496 A156497 * A156499 A156500 A156501

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved