A081471 a(n) = A081470(n)/n.

2, 6, 40, 420, 6048, 84, 2471040, 1485, 400400, 36036, 2559871641600, 3640, 4981904040960000, 41860800, 124032, 3357585, 48825552622389903360000, 5383840, 226293587575139731046400000, 318780, 284169600, 351153024768000

Offset

1,1

Links

Table of n, a(n) for n=1..22.

Crossrefs

Cf. A081467, A081468, A081469, A081470, A081472, A061243.

Sequence in context: A356513 A292407 A274275 * A133939 A045846 A238818

Adjacent sequences: A081468 A081469 A081470 * A081472 A081473 A081474

Keyword

nonn

Author

Amarnath Murthy, Mar 23 2003

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003

Status

approved