login
A195886
Number of lower triangles of an n X n integer array with all row and column sums zero and all row and column sums of squares <=8
0
1, 1, 5, 65, 1349, 90013, 17612909, 7690681987, 6760358933241
OFFSET
1,3
COMMENTS
Column 2 of A195892
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..2-2......2-2.....-1.1......2-2.....-2.2......2-2......2-2.....-2.2
.-2.2.0...-1.2-1....1-1.0...-2.1.1....0-2.2....0.0.0....0.0.0....0.0.0
..0.0.0.0.-1.0.1.0..0.0.0.0..0.1-1.0..2.0-2.0.-2.2.0.0.-2.2.0.0..2-2.0.0
CROSSREFS
Sequence in context: A121822 A056245 A357338 * A079482 A147625 A376039
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 24 2011
STATUS
approved