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 A345701 #15 Jun 24 2021 17:32:56
%S A345701 -1,2,23,80,191,374,647,1028,1535,2186,2999,3992,5183,6590,8231,10124,
%T A345701 12287,14738,17495,20576,23999,27782,31943,36500,41471,46874,52727,
%U A345701 59048,65855,73166,80999,89372,98303,107810,117911,128624,139967,151958,164615,177956,191999
%N A345701 a(n) = 3*n^3 - 1.
%C A345701 Compare to A056220(n) = 2*n^2 - 1.
%H A345701 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1).
%F A345701 a(n) = A117642(n) - 1.
%F A345701 G.f.: (4*x^3+9*x^2+6*x-1)/(x-1)^4. - _Alois P. Heinz_, Jun 24 2021
%F A345701 E.g.f.: exp(x)*(-1 + 3*x + 9*x^2 + 3*x^3). - _Stefano Spezia_, Jun 24 2021
%t A345701 Table[3 n^3 - 1, {n, 100}]
%Y A345701 Cf. A056220, A117642.
%K A345701 sign,easy
%O A345701 0,2
%A A345701 _Tanya Khovanova_, Jun 24 2021