OFFSET
1,1
COMMENTS
Row 6 of A223999
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/3628800)*n^12 + (1/302400)*n^11 + (419/3628800)*n^10 + (223/120960)*n^9 + (35411/1209600)*n^8 + (20443/50400)*n^7 + (17616857/3628800)*n^6 + (6342323/120960)*n^5 + (821276033/1814400)*n^4 + (103253527/37800)*n^3 + (186412339/16800)*n^2 - (24901729/840)*n - 64275 for n>8
EXAMPLE
Some solutions for n=3
..0..1..1....0..0..0....0..0..0....0..0..2....0..0..0....0..0..0....0..0..2
..0..1..2....0..0..2....0..2..2....1..1..2....0..2..2....0..0..0....0..1..1
..0..0..1....0..0..0....0..1..2....1..1..2....1..2..2....0..0..1....1..1..1
..0..2..2....0..0..0....1..1..1....0..1..1....0..1..2....1..1..2....0..2..2
..1..1..2....0..0..2....0..1..1....0..1..2....0..1..1....1..1..1....1..1..2
..1..1..2....1..1..2....2..2..2....1..2..2....0..2..2....0..1..2....0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2013
STATUS
approved