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 A131211 #5 Mar 31 2012 10:22:04
%S A131211 -1,-1,0,7,33,103,258,559,1091,1967,3332,5367,8293,12375,17926,25311,
%T A131211 34951,47327,62984,82535,106665,136135,171786,214543,265419,325519,
%U A131211 396044,478295,573677,683703,809998,954303,1118479,1304511,1514512,1750727,2015537,2311463,2641170,3007471,3413331
%N A131211 a(n)=(n^5-n-30)/30.
%C A131211 All numbers generated by the polynomial x^5-x-1 (see A126426) are congruent to 29 mod 30. The polynomial n^5-n-30 factors as (n-2)(n^4+2n^3+4n^2+8n+15)
%F A131211 a(n) = ((n^5 - n - 1) - 29)/30
%F A131211 G.f.: (-1+5*x-9*x^2+12*x^3-4*x^4+x^5)/(-1+x)^6. - _R. J. Mathar_, Nov 14 2007
%t A131211 Table[((n^5 - n - 1) - 29)/30, {n, -1, 100}]
%Y A131211 Cf. A126426, A134326, A134327.
%K A131211 sign
%O A131211 0,4
%A A131211 _Artur Jasinski_, Oct 20 2007, Nov 15 2007