OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..103
FORMULA
a(n) = sum{k=0..n, Product{j=0..k-1, C(2n-2k+j, n-k)/C(n-k+j, j)}}
Limit_{n->infinity} a(n)^(1/n^2) = r^(r/2) * (2-r)^(1 - r/2) = 1.238819877352130037160235229707224180528582190767293210626357503368..., where r = 0.370130616271672149875211085663371877443670059442239590157339853950... is the root of the equation (4 - 4*r)^(2 - 2*r) * r^r = (2-r)^(2-r). - Vaclav Kotesovec, Apr 02 2021
MATHEMATICA
Table[Sum[Product[Binomial[2*n-2*k+j, n-k]/Binomial[n-k+j, j], {j, 0, k-1}], {k, 0, n}], {n, 0, 20}] (* Vaclav Kotesovec, Apr 02 2021 *)
Table[Sum[BarnesG[k+1] * BarnesG[n-k+1]^2 * BarnesG[2*n-k+1] / BarnesG[2*n-2*k+1], {k, 0, n}] / BarnesG[n+1]^2, {n, 0, 20}] (* Vaclav Kotesovec, Apr 02 2021 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jun 13 2006
STATUS
approved