A156490 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 29.

2, 0, 86, 38, 6888, 50136, 13485160, 436323840, 284466859232, 19181871809320

Offset

2,1

Links

Table of n, a(n) for n=2..11.

Crossrefs

Sequence in context: A012451 A012447 A136558 * A216678 A136559 A009740

Adjacent sequences: A156487 A156488 A156489 * A156491 A156492 A156493

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved