OFFSET
1,1
COMMENTS
Row 2 of A220010.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/60)*n^5 - (1/4)*n^4 + (31/12)*n^3 - (35/4)*n^2 + (102/5)*n - 17 for n>2.
Conjectures from Colin Barker, Jul 29 2018: (Start)
G.f.: x*(4 - 17*x + 37*x^2 - 46*x^3 + 32*x^4 - 10*x^5 + x^6 + x^7) / (1 - x)^6.
a(n) = 6*a(n-1) - 15*a(n-2) + 20*a(n-3) - 15*a(n-4) + 6*a(n-5) - a(n-6) for n>8.
(End)
EXAMPLE
Some solutions for n=3:
3 1 1 1 1 0 2 1 1 3 0 0 3 3 3 2 2 0 3 2 2
3 1 1 1 0 0 1 1 1 3 0 0 3 3 3 2 0 0 3 2 2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 03 2012
STATUS
approved