A156471 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 19.

2, 28, 76, 6024, 39000, 4562152, 61580624, 13526490400, 338077231956, 183471645987760

Offset

3,1

Links

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

Crossrefs

Sequence in context: A336464 A245801 A296245 * A329595 A138964 A200040

Adjacent sequences: A156468 A156469 A156470 * A156472 A156473 A156474

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved