A156510 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 49.

1, 2, 10, 198, 10918, 2335392, 1569913286, 14728525914260, 599617717929388908

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Crossrefs

Sequence in context: A194971 A155200 A264563 * A246532 A159558 A297066

Adjacent sequences: A156507 A156508 A156509 * A156511 A156512 A156513

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved