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A127231 a(n)= numerator of ((2n)! + 1)/(n!). 1
3, 25, 721, 40321, 3628801, 479001601, 87178291201, 20922789888001, 6402373705728001, 2432902008176640001, 1124000727777607680001, 620448401733239439360001, 403291461126605635584000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..100

MATHEMATICA

Table[Numerator[((2n)! + 1)/(n!)], {n, 1, 30}]

CROSSREFS

Cf. A028387, A062938, A127227, A127228, A127229, A127230.

Sequence in context: A248417 A306795 A131310 * A062411 A136516 A002021

Adjacent sequences:  A127228 A127229 A127230 * A127232 A127233 A127234

KEYWORD

nonn,frac

AUTHOR

Artur Jasinski, Jan 09 2007

STATUS

approved

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Last modified August 6 15:50 EDT 2020. Contains 336255 sequences. (Running on oeis4.)