OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..282
Dmitry Kruchinin, Vladimir Kruchinin, Method for solving an iterative functional equation $A^{2^n}(x)=F(x)$, arXiv:1302.1986
FORMULA
a(n)=n!*T(n,1), T(n,m)=if n=m then 1 else 1/2((m^(n-m)*2^(n-m))/(n-m)!-sum(i=m+1..n-1, T(n,i)*T(i,m))).
EXAMPLE
A(x) = x + x^2 + x^4/6 - x^5/6 + x^6/20 + 41*x^7/90 - 99*x^8/56 + ...
CROSSREFS
KEYWORD
sign
AUTHOR
Vladimir Kruchinin, Nov 11 2011
STATUS
approved