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A139153
a(n) = (n!+6)/6.
4
2, 5, 21, 121, 841, 6721, 60481, 604801, 6652801, 79833601, 1037836801, 14529715201, 217945728001, 3487131648001, 59281238016001, 1067062284288001, 20274183401472001, 405483668029440001, 8515157028618240001
OFFSET
3,1
LINKS
MATHEMATICA
Table[(n! + 6)/6, {n, 3, 30}]
KEYWORD
nonn
AUTHOR
Artur Jasinski, Apr 11 2008
EXTENSIONS
Name corrected by Amiram Eldar, Oct 14 2024
STATUS
approved