OFFSET
0,4
EXAMPLE
E.g.f.: A(x) = 1 + x + x^2/2! + 2*x^3/3! + 6*x^4/4! + 27*x^5/5! + 163*x^6/6! +...
Related expansions.
A'(x) = A(B(x)) = 1 + x + 2*x^2/2! + 6*x^3/3! + 27*x^4/4! + 163*x^5/5! +...
where B'(x) = A(x):
B(x) = x + x^2/2! + x^3/3! + 2*x^4/4! + 6*x^5/5! + 27*x^6/6! + 163*x^7/7! +...
PROG
(PARI) {a(n) = my(A=1+x); for(i=1, n, A = 1 + intformal(subst(A, x, intformal(A +x*O(x^n))))); n!*polcoeff(A, n)}
for(n=0, 25, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 15 2013
STATUS
approved