OFFSET
1,2
COMMENTS
Column 2 of A198914.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 88*a(n-1) - 2613*a(n-2) + 33232*a(n-3) - 184531*a(n-4) + 400344*a(n-5) - 246519*a(n-6).
Conjectures from Colin Barker, Feb 22 2018: (Start)
G.f.: x*(1 - 84*x + 2295*x^2 - 25272*x^3 + 107312*x^4 - 128772*x^5) / ((1 - x)*(1 - 3*x)*(1 - 7*x)*(1 - 13*x)*(1 - 21*x)*(1 - 43*x)).
a(n) = (1036945 + 344344*3^n + 75465*7^n + 12040*13^n + 2795*21^n + 91*43^n) / 2817360.
(End)
EXAMPLE
Some solutions with values 0 to 7 for n=5:
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..2..3....2..3....1..2....2..3....2..3....2..3....2..3....2..3....2..3....2..3
..4..5....4..2....3..4....4..5....4..5....4..5....4..5....4..5....4..5....4..5
..0..3....1..5....5..6....2..3....6..7....3..6....6..2....6..1....0..6....6..7
..6..7....6..7....2..7....6..7....7..1....7..3....2..7....5..7....7..1....2..4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 31 2011
STATUS
approved