OFFSET
1,1
COMMENTS
Column 3 of A219883
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/19958400)*n^11 + (1/907200)*n^10 - (1/72576)*n^9 + (29/120960)*n^8 + (31/28800)*n^7 - (263/10800)*n^6 + (175169/362880)*n^5 - (1469677/362880)*n^4 + (901433/56700)*n^3 + (759737/50400)*n^2 - (837073/3960)*n + 342 for n>4
EXAMPLE
Some solutions for n=3
..1..0..0....2..0..0....0..0..0....1..0..0....2..1..1....1..0..0....1..0..1
..1..0..1....2..0..1....0..0..0....1..0..1....2..1..1....1..0..1....1..0..0
..1..2..1....2..1..2....1..0..0....2..1..1....2..1..2....2..2..2....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 30 2012
STATUS
approved