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 A351359 #16 Mar 13 2022 19:31:37 %S A351359 0,1,2,3,5,9,15,28,50,93,169,321,591,1118,2098,3973,7501,14273,27103, %T A351359 51722,98710,188935,361937,694911,1335471,2570966,4954794,9562165, %U A351359 18473141,35730493,69176559,134067508,260062338,504918961,981117305,1907954345 %N A351359 Number of binary necklaces with n beads and at least two consecutive black beads. %H A351359 Marko R. Riedel et al., <a href="https://math.stackexchange.com/questions/4376420/">Necklaces made of black and white beads</a>, Math StackExchange, Feb 2022. %H A351359 Marko Riedel, <a href="/A351359/a351359.maple.txt">Maple code for sequence from cited link.</a> %F A351359 a(n) = A000031(n) - A000358(n). %Y A351359 Cf. A351356, A351357, A351358, A351360, A351361. %K A351359 nonn %O A351359 1,3 %A A351359 _Marko Riedel_, Feb 08 2022