OFFSET
0,2
COMMENTS
Hankel transform of A168441.
FORMULA
a(n) ~ Pi^(n/2) * 2^(2*n^2 + n + 5/24) * n^(n^2 + n/2 - 1/24) / (sqrt(A) * exp(3*n^2/2 + n/2 - 1/24)), where A is the Glaisher-Kinkelin constant A074962. - Vaclav Kotesovec, Jan 23 2024
MATHEMATICA
Table[2^n*Product[(4*k*(4*k+2))^(n-k), {k, 1, n}], {n, 0, 10}] (* Vaclav Kotesovec, Jan 23 2024 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Nov 25 2009
STATUS
approved