OFFSET
1,1
COMMENTS
Row 4 of A239986
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/907200)*n^10 - (1/72576)*n^9 + (113/120960)*n^8 - (265/12096)*n^7 + (2651/5400)*n^6 - (141761/17280)*n^5 + (40878671/362880)*n^4 - (10305217/9072)*n^3 + (399085217/50400)*n^2 - (86061371/2520)*n + 68243 for n>12
EXAMPLE
Some solutions for n=4
..3..0..0..0....3..0..0..0....3..0..0..0....3..0..0..0....3..0..0..0
..2..1..0..0....2..3..0..3....2..1..0..0....2..1..0..0....2..3..0..3
..2..0..0..3....2..0..0..0....2..0..0..0....2..0..3..0....2..0..1..0
..3..2..0..2....2..0..0..0....3..2..0..0....3..0..0..1....3..2..0..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2014
STATUS
approved