OFFSET
1,1
COMMENTS
Row 6 of A224012
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (761/8553600)*n^12 + (811/302400)*n^11 + (4879/97200)*n^10 + (230029/362880)*n^9 + (10666727/1814400)*n^8 + (6162019/151200)*n^7 + (76144063/388800)*n^6 + (1772311/2688)*n^5 + (230134279/194400)*n^4 + (14927389/453600)*n^3 - (7982908/51975)*n^2 + (2910398/315)*n + 7207 for n>4
EXAMPLE
Some solutions for n=3
..0..0..1....0..0..1....0..0..1....0..0..1....0..0..0....0..0..1....0..0..0
..0..0..1....0..1..1....0..1..1....0..0..0....2..2..2....1..1..1....0..0..0
..0..1..2....0..2..2....1..2..2....0..0..0....0..0..2....1..1..2....0..1..2
..0..2..2....0..1..1....2..2..2....0..0..1....0..1..2....0..1..2....1..2..2
..2..2..2....1..1..2....0..2..2....2..2..2....0..2..2....1..2..2....0..0..1
..1..1..2....0..1..1....1..1..1....0..2..2....0..2..2....2..2..2....0..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2013
STATUS
approved