OFFSET
2,1
COMMENTS
Also the number of (not necessarily maximal) cliques in the (n-1)-(weak) Bruhat graph. - Eric W. Weisstein, Jul 29 2018
LINKS
Amiram Eldar, Table of n, a(n) for n = 2..450
Eric Weisstein's World of Mathematics, Bruhat Graph.
Eric Weisstein's World of Mathematics, Clique.
EXAMPLE
(1!+2)/2 = 3/2 is not an integer.
a(2) = (2!+2)/2 = 2.
MATHEMATICA
Table[(n! + 2)/2, {n, 2, 30}]
PROG
(PARI) a(n)=n!/2+1 \\ Charles R Greathouse IV, Jun 20 2012
CROSSREFS
a(n) = (n!+m)/m: A038507 (m=1), this sequence (m=2), A139150 (m=3), A139151 (m=4), A139152 (m=5), A139153 (m=6), A139154 (m=7), A139155 (m=8), A139156 (m=9), A139157 (m=10).
Offsets for above sequences are Kempner numbers A002034.
For smallest number of the form (m!+n)/n see A139148.
KEYWORD
nonn,easy
AUTHOR
Artur Jasinski, Apr 11 2008
STATUS
approved