A128147 Denominators of Hankel transform of 1/J(n+1), where J(n)=A001045(n).

1, 3, 7425, 47324536875, 25638858602403023525625, 12884448481414473203775367576406984041875, 115708032002378912987246508786002888051981871843289603877158640625

Offset

1,2

Comments

Numerators are A128146.

Links

Table of n, a(n) for n=1..7.

Formula

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.

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).

Crossrefs

Cf. A001045, A128146.

Sequence in context: A281788 A134776 A062595 * A326391 A068918 A356645

Adjacent sequences: A128144 A128145 A128146 * A128148 A128149 A128150

Keyword

easy,nonn,frac

Author

Paul Barry, Feb 16 2007

Status

approved