A127230 a(n) = (2n)! - 1.

1, 23, 719, 40319, 3628799, 479001599, 87178291199, 20922789887999, 6402373705727999, 2432902008176639999, 1124000727777607679999, 620448401733239439359999, 403291461126605635583999999, 304888344611713860501503999999, 265252859812191058636308479999999

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Formula

a(n) = -1 + A010050(n).

Mathematica

Table[(2n)! - 1, {n, 1, 30}]

Crossrefs

Cf. A010050, A028387, A062938, A127227, A127228, A127229, A127231.

Sequence in context: A023278 A013362 A013365 * A013361 A013363 A181745

Adjacent sequences: A127227 A127228 A127229 * A127231 A127232 A127233

Keyword

nonn

Author

Artur Jasinski, Jan 09 2007

Extensions

Entry revised by Alois P. Heinz, Mar 27 2021

Status

approved