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a(n) = (n! - 10)/10.
2

%I #12 Sep 08 2022 08:45:33

%S 11,71,503,4031,36287,362879,3991679,47900159,622702079,8717829119,

%T 130767436799,2092278988799,35568742809599,640237370572799,

%U 12164510040883199,243290200817663999

%N a(n) = (n! - 10)/10.

%C Original name: Natural numbers of the form (n!-10)/10.

%H Vincenzo Librandi, <a href="/A139185/b139185.txt">Table of n, a(n) for n = 5..300</a>

%p seq((factorial(n)-10)/10,n=5..25); # _Muniru A Asiru_, Oct 20 2018

%t Table[(n! - 10)/10, {n, 5, 20}]

%o (Magma) [(Factorial(n)-10)/10: n in [5..25]]; // _Vincenzo Librandi_, Jul 20 2011

%o (GAP) List([5..25],n->(Factorial(n)-10)/10); # _Muniru A Asiru_, Oct 20 2018

%Y Cf. A033312, A139172, A139173, A139174, A139175, A139176, A139177, A139183, A139184.

%K nonn,easy

%O 5,1

%A _Artur Jasinski_, Apr 11 2008

%E New name from _Jon E. Schoenfield_, Oct 19 2018