OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..435
Dmitry Kruchinin, Vladimir Kruchinin, Method for solving an iterative functional equation A^{2^n}(x)=F(x), arXiv:1302.1986 [math.CO], 2013.
FORMULA
Let B(x) = A(A(x)). B(B(x)) = F(x).
B(x) = G(2*x)/2, where G(x) is the g.f. for A309509.
EXAMPLE
B(x) = x + 4*x^2 + 8*x^3 + 16*x^4 + 32*x^5 + 256*x^7 + 768*x^8 - 14848*x^9 + 51200*x^10 + ...
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, May 03 2024
STATUS
approved