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 A133043 #16 Jul 07 2023 14:46:12
%S A133043 3,5,6,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,
%T A133043 29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,
%U A133043 52,53,54,55,56,57,58,59,60,61,62,63,64,65
%N A133043 Number of segments needed to draw the spiral of equilateral triangles with side lengths which follow the Padovan sequence.
%H A133043 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).
%F A133043 a(1)=3: a(2)=5: a(3)=6; for n>3, a(n)=n+4.
%t A133043 LinearRecurrence[{2,-1},{3,5,6,8,9},70] (* _Harvey P. Dale_, Dec 21 2018 *)
%o A133043 (PARI) a(n)=if(n>3,n+4,[3,5,6][n]) \\ _Charles R Greathouse IV_, Oct 27 2011
%Y A133043 Cf. Padovan sequence: A000931.
%K A133043 easy,nonn
%O A133043 1,1
%A A133043 _Omar E. Pol_, Nov 04 2007, Nov 05 2007