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 A017307 #19 Sep 08 2022 08:44:42
%S A017307 27,2197,12167,35937,79507,148877,250047,389017,571787,804357,1092727,
%T A017307 1442897,1860867,2352637,2924207,3581577,4330747,5177717,6128487,
%U A017307 7189057,8365427,9663597,11089567,12649337,14348907,16194277,18191447,20346417,22665187,25153757,27818127
%N A017307 a(n) = (10*n + 3)^3.
%H A017307 Vincenzo Librandi, <a href="/A017307/b017307.txt">Table of n, a(n) for n = 0..10000</a>
%H A017307 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1).
%F A017307 G.f.: (27 + 2089*x + 3541*x^2 + 343*x^3)/(x-1)^4. - _R. J. Mathar_, Mar 20 2018
%F A017307 a(n) = A000578(A017305(n)). - _Michel Marcus_, Apr 14 2022
%t A017307 (10 Range[0,30]+3)^3 (* or *) LinearRecurrence[{4,-6,4,-1},{27,2197,12167,35937},30] (* _Harvey P. Dale_, Jul 05 2021 *)
%o A017307 (Magma) [(10*n+3)^3: n in [0..35]]; // _Vincenzo Librandi_, Jul 31 2011
%o A017307 (PARI) a(n) = (10*n + 3)^3; \\ _Michel Marcus_, Apr 14 2022
%Y A017307 Cf. A000578, A017305.
%K A017307 nonn,easy
%O A017307 0,1
%A A017307 _N. J. A. Sloane_