OFFSET
0,4
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..80
Mathematics.StackExchange, sum involving the product of binomial coefficients, Nov 10 2016.
FORMULA
Conjecture: a(n) ~ (2/log(3))^n * (n-1)! / (Pi*sqrt(3)).
EXAMPLE
A002893(n) ~ 3^(2*n+3/2)/(4*Pi*n) * (1 - 1/(4*n) + 1/(4*n)^2 + 2/(4*n)^3 + 7/(4*n)^4 + 59/(4*n)^5 + ...)
CROSSREFS
KEYWORD
sign
AUTHOR
Vaclav Kotesovec, Nov 10 2016
STATUS
approved