OFFSET
0,2
LINKS
Paul D. Hanna, Table of n, a(n) for n = 0..60
FORMULA
a(n) ~ c * d^n / n^2, where d = 51.3157915205364... and c = 0.1124829020506... - Vaclav Kotesovec, Mar 19 2023
PROG
(PARI) {a(n) = my(A=[1, y], t); for(i=1, 2*n, A=concat(A, 0); t = ceil(sqrt(2*(#A)+9));
A[#A] = polcoeff( x*y*Ser(A) - sum(m=-t, t, (-1)^m*x^(m*(m+1)/2)*Ser(A)^m ), #A-1)); polcoeff(A[2*n+1], n, y)}
for(n=0, 30, print1( a(n), ", "));
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 19 2022
STATUS
approved