OFFSET
1,1
LINKS
Paul D. Hanna, Table of n, a(n) for n = 1..300
EXAMPLE
G.f.: A(x) = 2*x + 3*x^2 - 6*x^3 + 21*x^4 - 72*x^5 + 96*x^6 + 1740*x^7 - 22914*x^8 + 153162*x^9 - 282138*x^10 - 6414408*x^11 + 71836596*x^12 - 70221204*x^13 - 5275053936*x^14 +...
such that A( A(x) - x ) = 2*x + 9*x^2.
PROG
(PARI) {a(n) = my(A=x, V=[2, 3]); for(i=1, n, V = concat(V, 0); A=x*Ser(V); V[#V] = Vec( subst(G=A, x, A - x) )[#V]/(-3) ); V[n]}
for(n=1, 30, print1(a(n), ", "))
CROSSREFS
KEYWORD
sign
AUTHOR
Paul D. Hanna, Sep 23 2017
STATUS
approved