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 A360488 #11 Jul 04 2023 14:27:06
%S A360488 0,1,31,90,178,295,441,616,820,1053,1315,1606,1926,2275,2653,3060,
%T A360488 3496,3961,4455,4978,5530,6111,6721,7360,8028,8725,9451,10206,10990,
%U A360488 11803,12645,13516,14416,15345,16303,17290,18306,19351,20425,21528,22660,23821,25011,26230
%N A360488 31-gonal numbers: a(n) = n*(29*n-27)/2.
%H A360488 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3, -3, 1).
%F A360488 G.f.: x*(1 + 28*x)/(1 - x)^3.
%F A360488 E.g.f.: exp(x)*(x + 29*x^2/2).
%t A360488 Table[n (29 n - 27)/2, {n, 0, 30}]
%Y A360488 Cf. A360436, A051867, A051869.
%Y A360488 Cf. A126385, A126418, A126499.
%K A360488 nonn
%O A360488 0,3
%A A360488 _Nikolaos Pantelidis_, Feb 09 2023