OFFSET
0,3
COMMENTS
Equals antidiagonal sums of the triangle of unsigned Stirling numbers of the first kind (A008275).
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..400
EXAMPLE
G.f.: A(x) = 1 + x + 3*x^2 + 9*x^3 + 36*x^4 + 176*x^5 + 1030*x^6 + 7039*x^7 +...
where
A(x) = 1 + x*(1+x) + x^2*(1+x)*(2+x) + x^3*(1+x)*(2+x)*(3+x) + x^4*(1+x)*(2+x)*(3+x)*(4+x) +...
PROG
(PARI) {a(n)=polcoeff(sum(k=0, n, x^k*prod(j=1, k, j+x +x*O(x^n))), n)}
for(n=0, 30, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, May 11 2014
STATUS
approved