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 A351356 #14 Mar 13 2022 19:30:17 %S A351356 0,0,0,0,1,0,0,1,1,0,0,1,1,1,0,0,1,2,1,1,0,0,1,3,3,1,1,0,0,1,4,5,3,1, %T A351356 1,0,0,1,5,9,7,4,1,1,0,0,1,6,13,14,10,4,1,1,0,0,1,7,19,25,22,12,5,1,1, %U A351356 0,0,1,8,25,41,42,30,15,5,1,1,0,0,1,9,33,63,79,66,43,19,6,1,1,0,0,1,10,41,92,131,132,99,55,22,6,1,1 %N A351356 Triangle read by rows T(n,k): number of binary necklaces with n beads, k of them black, and at least two consecutive black beads. %H A351356 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 A351356 Marko R. Riedel, <a href="/A351356/a351356.maple.txt">Maple code for sequence from cited link.</a> %e A351356 Triangle begins: %e A351356 0; %e A351356 0, 0; %e A351356 0, 1, 0; %e A351356 0, 1, 1, 0; %e A351356 0, 1, 1, 1, 0; %e A351356 0, 1, 2, 1, 1, 0; %e A351356 0, 1, 3, 3, 1, 1, 0; %e A351356 0, 1, 4, 5, 3, 1, 1, 0; %e A351356 0, 1, 5, 9, 7, 4, 1, 1, 0; %e A351356 ... %Y A351356 Row sums are A351359. %Y A351356 Cf. A351357, A351358, A351360, A351361. %K A351356 nonn,tabl %O A351356 1,18 %A A351356 _Marko Riedel_, Feb 08 2022