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A139150
a(n) = (n!+3)/3.
4
3, 9, 41, 241, 1681, 13441, 120961, 1209601, 13305601, 159667201, 2075673601, 29059430401, 435891456001, 6974263296001, 118562476032001, 2134124568576001, 40548366802944001, 810967336058880001
OFFSET
3,1
LINKS
EXAMPLE
(2!+3)/3 = 5/3 is not an integer.
a(3) = (3!+3)/3 = 3.
MATHEMATICA
Table[(n! + 3)/3, {n, 3, 30}]
KEYWORD
nonn
AUTHOR
Artur Jasinski, Apr 11 2008
EXTENSIONS
Name corrected by Amiram Eldar, Oct 13 2024
STATUS
approved