OFFSET
0,2
COMMENTS
See A319203 for the Boas-Buck type recurrence.
FORMULA
O.g.f.: (log(f(x))' = (1/(1/f(x) + x^2*f(x) + 2*x^3*f(x)^2) - 1)/x, with the expansion of f given in A319201. f(x) = F^{[-1]}(x)/x, where F(t) = t/(1 - t^2 - t^3).
a(n) = (1/(n+1)!)*[d^(n+1)/dx^(n+1) (1 - x^2 - x^3)^(n+1)] evaluated at x = 0, for n >= 0. (Cf. Joerg Arndt's conjecture for A176806, which is proved there.)
EXAMPLE
CROSSREFS
KEYWORD
sign
AUTHOR
Wolfdieter Lang, Oct 29 2018
STATUS
approved