A156494 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 33.

4, 74, 184, 8852, 37944, 21579568, 316294683, 816922403024

Offset

3,1

Links

Table of n, a(n) for n=3..10.

Crossrefs

Sequence in context: A090212 A137046 A104335 * A232371 A114878 A368353

Adjacent sequences: A156491 A156492 A156493 * A156495 A156496 A156497

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved