OFFSET
1,1
COMMENTS
Column 4 of A223987
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (3551/47900160)*n^12 + (89357/39916800)*n^11 + (132341/4354560)*n^10 + (177787/725760)*n^9 + (1892753/1451520)*n^8 + (5834147/1209600)*n^7 + (11057083/870912)*n^6 + (17370313/725760)*n^5 + (6973385/217728)*n^4 + (26874943/907200)*n^3 + (186503/10395)*n^2 + (8831/1386)*n + 1
EXAMPLE
Some solutions for n=3
..1..1..0..0....0..1..0..0....1..0..0..0....1..1..1..2....0..1..1..0
..1..2..0..0....1..3..2..0....1..3..2..0....1..1..1..2....0..2..3..2
..2..2..1..1....3..3..3..2....2..3..3..3....1..2..2..3....1..3..3..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2013
STATUS
approved