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 A181342 #21 Sep 08 2022 08:45:54
%S A181342 1,26,186,726,2031,4626,9176,16486,27501,43306,65126,94326,132411,
%T A181342 181026,241956,317126,408601,518586,649426,803606,983751,1192626,
%U A181342 1433136,1708326,2021381,2375626,2774526,3221686,3720851,4275906
%N A181342 a(n) = (35*n^4 - 105*n^3 + 160*n^2 - 120*n + 36)/6.
%C A181342 First bisection of A175898.
%H A181342 Vincenzo Librandi, <a href="/A181342/b181342.txt">Table of n, a(n) for n = 1..1000</a>
%H A181342 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (5,-10,10,-5,1).
%F A181342 a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) + 140 for n > 4; a(1)=1, a(2)=26, a(3)=186, a(4)=726.
%F A181342 G.f.: (1 + 21*x + 66*x^2 + 46*x^3 + 6*x^4)/(1-x)^5.
%F A181342 a(-n+1) = A181343(n). - _Bruno Berselli_, Aug 23 2011
%t A181342 Table[(35n^4-105n^3+160n^2-120n+36)/6,{n,30}] (* or *) LinearRecurrence[ {5,-10,10,-5,1},{1,26,186,726,2031},30] (* _Harvey P. Dale_, Feb 19 2017 *)
%o A181342 (Magma) [ (35*n^4-105*n^3+160*n^2-120*n+36)/6: n in [1..30] ];
%o A181342 (PARI) a(n)=(35*n^4-105*n^3+160*n^2-120*n+36)/6 \\ _Charles R Greathouse IV_, Jul 06 2017
%Y A181342 Cf. A175898, A181343.
%K A181342 nonn,easy
%O A181342 1,2
%A A181342 _Klaus Brockhaus_, Oct 14 2010