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 A361361 #13 Mar 11 2023 19:48:36 %S A361361 1,0,0,0,1,1,1,1,1,2,2,5,5,5,2,2,6,11,33,48,66,48,33,11,6,21,68,257, %T A361361 556,950,1071,950,556,257,68,21,94,510,2443,7126,15393,23644,27606, %U A361361 23644,15393,7126,2443,510,94,540,4712,27682,102122,270957,526783,781292,887305,781292,526783,270957,102122,27682,4712,540 %N A361361 Triangle read by rows: T(n,k) is the number of bicolored cubic graphs on 2n unlabeled vertices with k vertices of the first color, n >= 0, 0 <= k <= 2*n. %C A361361 Adjacent vertices may have the same color. %H A361361 Andrew Howroyd, <a href="/A361361/b361361.txt">Table of n, a(n) for n = 0..440</a> (rows 0..20) %e A361361 Triangle begins: %e A361361 1 %e A361361 0, 0, 0; %e A361361 1, 1, 1, 1, 1; %e A361361 2, 2, 5, 5, 5, 2, 2; %e A361361 6, 11, 33, 48, 66, 48, 33, 11, 6; %e A361361 21, 68, 257, 556, 950, 1071, 950, 556, 257, 68, 21; %e A361361 ... %Y A361361 Columns k=0..2 are A005638, A361410, A361411. %Y A361361 Row sums are A361362. %Y A361361 Central coefficients are A361409. %Y A361361 Cf. A321304 (connected), A361404. %K A361361 nonn,tabf %O A361361 0,10 %A A361361 _Andrew Howroyd_, Mar 10 2023