OFFSET
3,2
FORMULA
E.g.f.: (log(1 + x))^3/(6 * (1 - x)).
PROG
(PARI) a(n) = n!*polcoef(sum(k=3, n, binomial(x, k)), 3);
(PARI) N=40; x='x+O('x^N); Vec(serlaplace(log(1+x)^3/(6*(1-x))))
(Python)
from sympy.abc import x
from sympy import ff, expand
def A348064(n): return sum(ff(n, n-k)*expand(ff(x, k)).coeff(x**3) for k in range(3, n+1)) # Chai Wah Wu, Sep 27 2021
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Sep 26 2021
STATUS
approved