A156413 Number of 13 X 13 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

1, 1384, 481320, 23622288, 667960824, 4186295040, 26532092944, 72256187200, 617153224314, 1117730631388, 5750051401712, 11298978667872, 59576593947316, 150978985010061, 286675559366712, 512365063156800

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Crossrefs

Sequence in context: A092128 A360215 A156410 * A029819 A336192 A345526

Adjacent sequences: A156410 A156411 A156412 * A156414 A156415 A156416

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved