OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/106748928000)*n^16 + (1/1482624000)*n^15 + (7/266872320)*n^14 + (127/197683200)*n^13 + (315179/28740096000)*n^12 + (24499/177408000)*n^11 + (89507/65318400)*n^10 + (112109/9676800)*n^9 + (68633371/746496000)*n^8 + (11395841/16128000)*n^7 + (6723664007/1437004800)*n^6 + (295741651/13305600)*n^5 + (262119224347/5189184000)*n^4 - (16331232329/1297296000)*n^3 + (12600631/343200)*n^2 + (38790413/360360)*n - 166 for n>2.
EXAMPLE
Some solutions for n=3
..0..0..0....2..0..0....2..0..0....0..0..0....1..2..1....1..1..1....0..1..2
..1..1..2....2..0..0....0..0..0....1..0..0....2..2..1....1..2..2....1..2..0
..1..2..1....0..0..0....0..1..1....2..1..1....2..1..1....2..2..2....2..2..0
..2..2..1....2..1..0....2..2..1....2..2..2....2..1..1....2..2..0....2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 05 2013
STATUS
approved