A156478 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 22.

2, 44, 40, 7838, 31206, 5100574, 62202832, 23258023832, 999916709280, 912189500014368

Offset

3,1

Links

Table of n, a(n) for n=3..12.

Crossrefs

Sequence in context: A177490 A203498 A392550 * A156508 A239865 A007367

Adjacent sequences: A156475 A156476 A156477 * A156479 A156480 A156481

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved