OFFSET
1,2
COMMENTS
Numerators are A128146.
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
KEYWORD
easy,nonn,frac
AUTHOR
Paul Barry, Feb 16 2007
STATUS
approved