A052225 (n+1)!*(n+3)-3.

5, 27, 141, 837, 5757, 45357, 403197, 3991677, 43545597, 518918397, 6706022397, 93405311997, 1394852659197, 22230464255997, 376610217983997, 6758061133823997, 128047474114559997, 2554547108585471997

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Formula

a(n) = A001048(n+2) - 3. - Michel Marcus, Jun 19 2013

Example

a(2)=27 because 27=(2+1)!*(2+3)-3 or 3*2*1*5-3.

Prog

(PARI) a(n) = (n+1)!*(n+3) - 3 \\ Michel Marcus, Jun 19 2013

Crossrefs

Sequence in context: A037675 A221673 A257061 * A293295 A343208 A015535

Adjacent sequences: A052222 A052223 A052224 * A052226 A052227 A052228

Keyword

nonn,easy

Author

Andreas Ulvaer (aulvaer(AT)yahoo.com), Feb 20 2000

Extensions

More terms from James A. Sellers, Feb 22 2000

Status

approved