A156513 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 50.

3, 4, 174, 272, 48562, 360468, 211236822, 5909410784, 14595969900224

Offset

2,1

Links

Table of n, a(n) for n=2..10.

Crossrefs

Sequence in context: A041595 A041741 A041903 * A082213 A097172 A042081

Adjacent sequences: A156510 A156511 A156512 * A156514 A156515 A156516

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved