OFFSET
0,2
FORMULA
Conjecture: a(n) = 62*n^2 + 30*n - 55 for n >= 10.
Conjectures from Colin Barker, Jan 06 2018: (Start)
G.f.: (1 + 6*x + 17*x^2 + 32*x^3 + 48*x^4 + 64*x^5 + 80*x^6 - 24*x^7 - 96*x^8 - 48*x^9 - 8*x^10 + 28*x^11 + 20*x^12 + 4*x^13) / (1 - x)^3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>13.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Jan 05 2018
STATUS
approved