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 A258443 #8 Jan 10 2019 11:55:09
%S A258443 10039491,9002622519,632913667646139,567557703066557511,
%T A258443 39901154831776816303176,35780879673931397997716604,
%U A258443 2515512364950294599811639195654,2255755394249701567388335466918226,158586950299955622830941025383070794461
%N A258443 9-gonal numbers (A001106) that are the sum of eleven consecutive 9-gonal numbers.
%H A258443 Colin Barker, <a href="/A258443/b258443.txt">Table of n, a(n) for n = 1..255</a>
%H A258443 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1,63043598,-63043598,-1,1).
%F A258443 a(n) = a(n-1) + 63043598*a(n-2) - 63043598*a(n-3) - a(n-4) + a(n-5).
%F A258443 G.f.: -99*x*(4*x^4+572*x^3-211815202*x^2+90834172*x+101409) / ((x-1)*(x^2-7940*x+1)*(x^2+7940*x+1)).
%e A258443 10039491 is in the sequence because A001106(1694) = 10039491 = 894861 + 898404 + 901954 + 905511 + 909075 + 912646 + 916224 + 919809 + 923401 + 927000 + 930606 = A001106(506) + ... + A001106(516).
%t A258443 LinearRecurrence[{1,63043598,-63043598,-1,1},{10039491,9002622519,632913667646139,567557703066557511,39901154831776816303176},10] (* _Harvey P. Dale_, Jan 10 2019 *)
%o A258443 (PARI) Vec(-99*x*(4*x^4+572*x^3-211815202*x^2+90834172*x+101409) / ((x-1)*(x^2-7940*x+1)*(x^2+7940*x+1)) + O(x^20))
%Y A258443 Cf. A001106, A258441, A258442, A258444.
%K A258443 nonn,easy
%O A258443 1,1
%A A258443 _Colin Barker_, May 30 2015