A156392 Number of 7X7 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

1, 20, 132, 294, 440, 270, 1414, 635, 1716, 2096, 5108, 9108, 3066, 3096, 9216, 2952, 9131, 8172, 21624, 39000, 31638, 11364, 31206, 14100, 32236, 18704, 64560, 102762, 51947, 50136, 38544, 49526, 74688, 37944, 138156, 259560, 175374, 76680, 182640

Offset

0,2

Links

Table of n, a(n) for n=0..38.

Crossrefs

Sequence in context: A304507 A005551 A006417 * A219574 A356272 A188145

Adjacent sequences: A156389 A156390 A156391 * A156393 A156394 A156395

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved