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 A351357 #15 Mar 13 2022 19:31:07 %S A351357 0,0,0,0,0,0,0,0,1,0,0,0,1,1,0,0,0,1,1,1,0,0,0,1,2,1,1,0,0,0,1,3,3,1, %T A351357 1,0,0,0,1,4,6,4,1,1,0,0,0,1,5,10,9,4,1,1,0,0,0,1,6,15,19,12,5,1,1,0, %U A351357 0,0,1,7,21,33,29,15,5,1,1,0,0,0,1,8,28,54,60,42,19,6,1,1,0,0,0,1,9,36,81,111,96,55,22,6,1,1 %N A351357 Irregular triangle read by rows T(n,k): number of binary necklaces with n beads, k of them black, and at least three consecutive black beads. %H A351357 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. %e A351357 Triangle begins: %e A351357 0, 0; %e A351357 0, 0, 0; %e A351357 0, 0, 0, 1; %e A351357 0, 0, 0, 1, 1; %e A351357 0, 0, 0, 1, 1, 1; %e A351357 0, 0, 0, 1, 2, 1, 1; %e A351357 0, 0, 0, 1, 3, 3, 1, 1; %e A351357 0, 0, 0, 1, 4, 6, 4, 1, 1; %Y A351357 Row sums are A351360. %Y A351357 Cf. A351356, A351358, A351359, A351361. %K A351357 nonn,tabf %O A351357 1,25 %A A351357 _Marko Riedel_, Feb 08 2022