|
%I #4 Dec 18 2015 18:18:12
%S 3,54,7722,9318805,98721672541,9463992096711104,8396505064286814402888
%N Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*2
%C Column 2 of A214011
%e Some solutions for n=3
%e ..0..2..0....0..0..0....2..0..0....2..0..0....0..0..0....0..0..0....0..0..1
%e ..0..0..0....0..0..4....0..1..0....0..0..2....0..1..0....0..4..0....0..0..3
%e ..0..0..5....0..1..0....0..0..0....0..1..2....0..2..0....1..0..1....0..3..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 30 2012
| 