OFFSET
1,2
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..100
Index entries for linear recurrences with constant coefficients, signature (6,-14,16,-9,2).
FORMULA
a(n) = (1/6)*(-120 + 15*2^(n+3) - 81*n - 21*n^2 - 4*n^3).
a(n) = 6*a(n-1) - 14*a(n-2) + 16*a(n-3) - 9*a(n-4) + 2*a(n-5).
G.f.: f(x)/g(x), where f(x) = x*(1 + 3*x) and g(x) = (1 - 2*x)*(1 - x)^4.
MATHEMATICA
(See A213756.)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jun 20 2012
STATUS
approved