OFFSET
0,5
LINKS
Paul D. Hanna, Table of n, a(n) for n = 0..200
EXAMPLE
G.f.: A(x) = 1 - x^2 - x^3 + 4*x^4 + 10*x^5 - 16*x^6 - 58*x^7 + 139*x^8 +...
where
1-x = 1 - (A(x) + x)*x + (A(x)^2 + x^2)^2*x^2 - (A(x)^3 + x^3)^3*x^3 + (A(x)^4 + x^4)^4*x^4 - (A(x)^5 + x^5)^5*x^5 + (A(x)^6 + x^6)^6*x^6 - (A(x)^7 + x^7)^7*x^7 +-...
PROG
(PARI) {a(n)=local(A=[1]); for(i=1, n, A=concat(A, 0); A[#A]=Vec(sum(k=0, #A, (Ser(A)^k + x^k)^k*(-x)^k))[#A+1]); A[n+1]}
for(n=0, 30, print1(a(n), ", "))
CROSSREFS
KEYWORD
sign
AUTHOR
Paul D. Hanna, Sep 26 2014
STATUS
approved