OFFSET
0,21
LINKS
Robert Israel, Table of n, a(n) for n = 0..10000
FORMULA
a(n) = -(1/n)*Sum_{k=1..n} A284098(k)*a(n-k), a(0) = 1.
a(n) = (-1)^n * A280456(n). - Robert Israel, Apr 09 2017
MAPLE
N:= 100: # to get a(0)..a(N)
V:= Vector(N+1):
V[1]:= 1:
for k from 0 to floor((N-1)/6) do
V[6*k+2..N+1]:= V[6*k+2..N+1]+V[1..N-6*k]
od:
seq((-1)^n*V[n+1], n=0..N); # Robert Israel, Apr 09 2017
MATHEMATICA
CoefficientList[Series[Product[1 - x^(6*k+1), {k, 0, 79}], {x, 0, 79}], x] (* Indranil Ghosh, Mar 29 2017 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Mar 29 2017
STATUS
approved