A156399 Number of 9 X 9 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

1, 76, 1728, 9712, 34814, 40416, 130456, 149480, 644220, 297215, 1380432, 3924896, 4260776, 4171320, 5913728, 6328576, 17481322, 7436362, 23029656, 61580624, 75335814, 56271108, 62202832, 54904272, 183254724, 62428100, 176105168

Offset

0,2

Links

Table of n, a(n) for n=0..26.

Crossrefs

Sequence in context: A185819 A270960 A060190 * A232830 A278092 A153177

Adjacent sequences: A156396 A156397 A156398 * A156400 A156401 A156402

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved