OFFSET
1,1
COMMENTS
Column 6 of A190041.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 4*n^2 - 8*n + 11 for n>5.
Conjectures from Colin Barker, May 04 2018: (Start)
G.f.: x*(10 - 12*x + 6*x^2 + x^3 + 3*x^4 + 2*x^5 - x^6 - x^7) / (1 - x)^3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>8.
(End)
EXAMPLE
Some solutions for n=3:
..3....1....3....3....2....1....1....5....1....0....2....2....1....0....2....3
..3....3....6....3....4....3....2....6....3....6....2....2....5....3....2....3
..6....3....6....3....4....3....3....6....3....6....4....4....5....3....2....3
..6....6....6....6....6....4....3....6....3....6....6....4....6....3....4....3
..6....6....6....6....6....6....6....6....6....6....6....6....6....6....6....6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2011
STATUS
approved