OFFSET
1,2
COMMENTS
Column 2 of A221749
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..59
FORMULA
Empirical: a(n) = 3*a(n-1) +33*a(n-2) +7*a(n-3) -165*a(n-4) -152*a(n-5) -189*a(n-6) -572*a(n-7) -280*a(n-8) -223*a(n-9) -745*a(n-10) -574*a(n-11) -882*a(n-12) -773*a(n-13) -298*a(n-14) -128*a(n-15) +4*a(n-16) +19*a(n-17) +3*a(n-18)
EXAMPLE
Some solutions for n=3
..2..1....0..3....0..2....2..1....1..2....2..0....0..2....0..1....0..1....1..0
..1..0....0..1....1..2....1..0....2..1....1..1....3..1....3..1....1..1....2..1
..2..0....1..1....0..1....1..1....0..0....1..1....0..0....0..1....3..0....1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 24 2013
STATUS
approved