login
A137565
Hankel transform of quadruple factorial numbers A001813.
1
1, 8, 3072, 141557760, 1461147874099200, 5429466527263925207040000, 10652562037579218110269404217344000000, 15215364593060190936848463156185060517032755200000000
OFFSET
0,2
FORMULA
a(n)=Product{k=0..n-1, (8(k+1)(2k+1))^(n-k)}.
a(n)=8^C(n+1,2)*Product{k=1..n, k!*Product{i=1..k-1, 2i+1}}; a(n)=8^C(n+1,2)*A000178(n)*A057863(n).
CROSSREFS
Sequence in context: A300039 A282187 A217270 * A281323 A145260 A201100
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jan 26 2008, Apr 25 2008
EXTENSIONS
Edited by N. J. A. Sloane, May 14 2008 at the suggestion of R. J. Mathar.
STATUS
approved