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A127230 a(n) = (2n)! - 1. 5
1, 23, 719, 40319, 3628799, 479001599, 87178291199, 20922789887999, 6402373705727999, 2432902008176639999, 1124000727777607679999, 620448401733239439359999, 403291461126605635583999999, 304888344611713860501503999999, 265252859812191058636308479999999 (list; graph; refs; listen; history; text; internal format)
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

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Last modified April 10 21:21 EDT 2021. Contains 342856 sequences. (Running on oeis4.)