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A127231
a(n) = (2n)! + 1.
1
2, 3, 25, 721, 40321, 3628801, 479001601, 87178291201, 20922789888001, 6402373705728001, 2432902008176640001, 1124000727777607680001, 620448401733239439360001, 403291461126605635584000001, 304888344611713860501504000001, 265252859812191058636308480000001
OFFSET
0,1
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Jan 09 2007
EXTENSIONS
Entry revised by N. J. A. Sloane, Mar 26 2021
STATUS
approved