OFFSET
0,3
COMMENTS
Number of n X n symmetric matrices with nonnegative integer entries and all row and column sums 5. - Andrew Howroyd, Apr 07 2020
EXAMPLE
All solutions for 10X2
..1..1....1..1....1..1....1..1....1..0....1..1
..1..1....1..0....1..1....1..1....1..0....1..1
..1..1....1..0....1..1....1..0....1..0....1..1
..1..1....1..0....1..1....1..0....1..0....1..0
..1..0....1..0....1..1....1..0....1..0....1..0
..0..1....0..1....0..0....0..1....0..1....0..1
..0..0....0..1....0..0....0..1....0..1....0..1
..0..0....0..1....0..0....0..1....0..1....0..0
..0..0....0..1....0..0....0..0....0..1....0..0
..0..0....0..0....0..0....0..0....0..1....0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2011
EXTENSIONS
a(0)=1 prepended and terms a(10) and beyond from Andrew Howroyd, Apr 07 2020
STATUS
approved