OFFSET
1,1
COMMENTS
Column 4 of A224173
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (3551/47900160)*n^12 + (17561/13305600)*n^11 + (376693/21772800)*n^10 + (106499/725760)*n^9 + (229093/290304)*n^8 + (4775993/1209600)*n^7 + (239805679/21772800)*n^6 + (2313469/80640)*n^5 + (85217281/1088640)*n^4 - (37150333/907200)*n^3 - (7297121/207900)*n^2 + (474241/1386)*n - 383 for n>3
EXAMPLE
Some solutions for n=3
..0..0..1..1....0..1..1..0....3..1..1..0....0..2..1..1....0..2..2..0
..1..2..2..3....0..3..2..1....3..3..3..3....3..2..2..1....0..3..3..0
..2..2..2..3....2..3..2..2....3..3..3..3....3..3..3..1....2..3..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 31 2013
STATUS
approved