A128147 - OEIS

%I #4 Mar 15 2023 11:49:52

%S 1,3,7425,47324536875,25638858602403023525625,

%T 12884448481414473203775367576406984041875,

%U 115708032002378912987246508786002888051981871843289603877158640625

%N Denominators of Hankel transform of 1/J(n+1), where J(n)=A001045(n).

%C Numerators are A128146.

%F a(n) = (Product_{k=1..2n-1} J(n)^(n-abs(k-n)))/(Product_{k=1..n} (Product_{i=1..k-1} J(i)))^2.

%F a(n) = J(n)^n*(Product_{k=1..n-1} J(n-k)^(n-k)*J(n+k)^(n-k))/(Product_{k=0..n-1} (Product_{i=1..k} J(i))^2).

%Y Cf. A001045, A128146.

%K easy,nonn,frac

%O 1,2

%A _Paul Barry_, Feb 16 2007