A156462 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 15.

22, 0, 3200, 2952, 1651208, 6328576, 2727888448, 31390349120, 15449498784320, 512365063156800

Offset

4,1

Links

Table of n, a(n) for n=4..13.

Crossrefs

Sequence in context: A225343 A252670 A297813 * A040488 A040489 A040490

Adjacent sequences: A156459 A156460 A156461 * A156463 A156464 A156465

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved