OFFSET
1,1
COMMENTS
Column 3 of A226992
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/1307674368000)*n^15 + (1/10897286400)*n^14 + (47/9340531200)*n^13 + (79/479001600)*n^12 + (2341/653184000)*n^11 + (2369/43545600)*n^10 + (136267/228614400)*n^9 + (1466509/304819200)*n^8 + (37910533/1306368000)*n^7 + (1168211/8709120)*n^6 + (362956849/718502400)*n^5 + (181454291/119750400)*n^4 + (8088745109/2270268000)*n^3 + (480216697/75675600)*n^2 + (6472/819)*n + 5 for n>7
EXAMPLE
Some solutions for n=4
..1..2..2....0..0..1....0..1..2....0..1..2....1..2..2....0..0..0....0..0..1
..2..2..1....0..1..3....0..2..4....1..3..3....2..2..1....0..1..2....0..1..2
..3..2..1....1..3..4....2..2..2....2..3..4....3..3..3....1..2..3....1..2..1
..4..4..3....3..3..2....4..2..0....3..2..3....4..4..4....2..2..2....3..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2013
STATUS
approved