OFFSET
1,1
COMMENTS
Row 5 of A214384.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..33
FORMULA
Empirical: a(n) = (250321/163459296000)*n^15 + (57931/605404800)*n^14 + (5905981/2335132800)*n^13 + (63247/1710720)*n^12 + (294798431/898128000)*n^11 + (9968141/5443200)*n^10 + (367113701/57153600)*n^9 + (34853713/2540160)*n^8 + (2644103053/163296000)*n^7 + (1285847/194400)*n^6 - (1094962783/179625600)*n^5 - (22292609/2993760)*n^4 - (316949617/252252000)*n^3 + (47012731/37837800)*n^2 + (3659/9009)*n.
EXAMPLE
Some solutions for n=3
......0..........0..........2..........0..........0..........0..........0
.....2.0........0.1........1.2........0.2........0.3........0.2........0.2
....3.0.2......2.0.2......0.2.1......3.0.2......1.0.3......0.1.2......0.3.1
...1.3.0.2....2.1.0.2....0.1.3.1....3.0.3.2....1.0.2.3....0.1.0.2....3.0.3.1
..0.3.2.0.2..0.3.1.0.2..0.1.3.2.0..1.3.0.3.2..1.2.0.3.0..0.2.0.2.1..3.0.3.0.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 14 2012
STATUS
approved