OFFSET
1,1
COMMENTS
Column 3 of A219816
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/13305600)*n^11 - (1/725760)*n^10 + (1/51840)*n^9 + (1/6048)*n^8 - (5437/1209600)*n^7 + (2519/34560)*n^6 - (1003/3024)*n^5 - (47861/72576)*n^4 + (820873/64800)*n^3 - (230969/10080)*n^2 - (577453/27720)*n + 76 for n>4
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..0....1..0..0....0..0..0....0..0..0....2..0..0....0..0..0
..1..0..0....0..0..0....2..0..0....0..0..0....0..0..0....2..2..0....2..0..0
..2..1..0....2..0..0....2..1..0....0..0..0....1..1..1....2..2..2....2..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 28 2012
STATUS
approved