This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A139150 #14 Oct 14 2024 01:38:03
%S A139150 3,9,41,241,1681,13441,120961,1209601,13305601,159667201,2075673601,
%T A139150 29059430401,435891456001,6974263296001,118562476032001,
%U A139150 2134124568576001,40548366802944001,810967336058880001
%N A139150 a(n) = (n!+3)/3.
%H A139150 Amiram Eldar, <a href="/A139150/b139150.txt">Table of n, a(n) for n = 3..450</a>
%e A139150 (2!+3)/3 = 5/3 is not an integer.
%e A139150 a(3) = (3!+3)/3 = 3.
%t A139150 Table[(n! + 3)/3, {n, 3, 30}]
%Y A139150 Cf. A007749, A020458, A082672, A089085, A089130, A117141, A139056-A139066, A139068, A137390, A139070-A139075, A139148-A139157, A139159, A139160, A139161, A139162.
%K A139150 nonn
%O A139150 3,1
%A A139150 _Artur Jasinski_, Apr 11 2008
%E A139150 Name corrected by _Amiram Eldar_, Oct 13 2024