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 A103623 #27 Mar 12 2024 08:47:53
%S A103623 1,10,1023,29524,349525,2441406,12093235,47079208,153391689,435848050,
%T A103623 1111111111,2593742460,5628851293,11488207654,22250358075,41189313616,
%U A103623 73300775185,125999618778,210027483919,340614792100,538947368421,833994048910,1264758228163
%N A103623 a(n) = n^9 + n^8 + n^7 + n^6 + n^5 + n^4 + n^3 + n^2 + n + 1.
%H A103623 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (10,-45,120,-210,252,-210,120,-45,10,-1).
%F A103623 G.f.: (341*x^8 +11352*x^7 +77440*x^6 +153824*x^5 +99330*x^4 +19624*x^3 +968*x^2 +1)/(x -1)^10. - _Colin Barker_, Oct 29 2012
%F A103623 a(n) = (n^10-1)/(n-1) with a(1) = 10. - _Arkadiusz Wesolowski_, Mar 30 2013
%t A103623 With[{eq=Total[n^Range[0,9]]},Table[eq,{n,0,20}]] (* _Harvey P. Dale_, Dec 16 2011 *)
%o A103623 (PARI) a(n)=n^9+n^8+n^7+n^6+n^5+n^4+n^3+n^2+n+1 \\ _Charles R Greathouse IV_, Oct 07 2015
%Y A103623 Cf. A001017.
%K A103623 nonn,easy
%O A103623 0,2
%A A103623 Douglas Winston (douglas.winston(AT)srupc.com), Mar 25 2005