A202030 Number of nX5 zero-sum -1..1 arrays with rows and columns lexicographically nondecreasing.

3, 130, 8312, 537572, 29859761, 1387552127, 54711391946, 1867753201968, 56202066220732, 1512619583145180, 36846458203653196, 820282579722532855, 16824341003927003916, 320094924612213368550, 5682193494807852979273

Offset

1,1

Comments

Column 5 of A202033

Links

R. H. Hardin, Table of n, a(n) for n = 1..47

Example

Some solutions for n=3
.-1..0..0..1..1...-1.-1.-1..1..1...-1.-1..1..1..1...-1.-1..0..0..1
..1..0..0.-1.-1...-1..0..0.-1..1...-1..0.-1.-1..0....1..1.-1..0.-1
..1..0..0.-1..0....0..1..1.-1..1....1.-1..1..1..0....1..1..0..0.-1

Crossrefs

Sequence in context: A113558 A003370 A156957 * A048434 A249379 A139943

Adjacent sequences: A202027 A202028 A202029 * A202031 A202032 A202033

Keyword

nonn

Author

R. H. Hardin, Dec 09 2011

Status

approved