A176493 A091137(n)/(n+1).

1, 1, 4, 6, 144, 240, 8640, 15120, 403200, 725760, 43545600, 79833600, 201180672000, 373621248000, 2092278988800, 3923023104000, 1883051089920000, 3556874280960000, 2688996956405760000, 5109094217170944000, 1605715325396582400000, 3065456530302566400000

Offset: 0

Author

Paul Curtz, Apr 19 2010

Keywords

• nonn

Formula

a(n) = A174727(n)/A027760(n+1).