A156434 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 4.

1, 2, 4, 11, 57, 1082, 42354, 2278938, 154294582, 12767337844, 1267231350044, 148617033979348, 20331541618406216

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Crossrefs

Sequence in context: A091233 A173312 A351184 * A007903 A182100 A327484

Adjacent sequences: A156431 A156432 A156433 * A156435 A156436 A156437

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved