OFFSET
1,1
COMMENTS
Column 7 of A252820
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/660441600)*n^14 + (1/9434880)*n^13 + (1/311850)*n^12 + (283/4989600)*n^11 + (23/34560)*n^10 + (5/896)*n^9 + (55843/1587600)*n^8 + (153973/907200)*n^7 + (4462807/7257600)*n^6 + (239717/145152)*n^5 + (50459/14400)*n^4 + (1240207/302400)*n^3 + (269664683/50450400)*n^2 + (308941/120120)*n + 4
EXAMPLE
Some solutions for n=4
..0..1..1..2..3..4..5....0..1..2..3..4..5..5....0..1..2..3..3..4..4
..0..1..2..3..3..4..5....1..2..3..3..4..5..5....1..2..3..3..4..4..5
..1..2..3..3..4..5..6....2..3..3..4..5..6..6....1..2..3..4..5..5..6
..2..3..4..4..5..6..7....3..4..4..5..6..7..7....1..2..3..4..5..6..7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2014
STATUS
approved