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 A370771 #8 Mar 02 2024 03:16:21 %S A370771 1,1,1,1,1,1,1,2,1,1,1,4,2,1,1,1,9,6,2,1,1,1,20,21,6,2,1,1,1,48,83,25, %T A370771 6,2,1,1,1,115,356,126,25,6,2,1,1,1,286,1599,745,135,25,6,2,1,1,1,719, %U A370771 7434,4784,895,135,25,6,2,1,1,1,1842,35381,32372,6846,915,135,25,6,2,1,1 %N A370771 Triangle read by rows: T(n,k) is the number of k-trees with n unlabeled nodes rooted at a front. %C A370771 A front is a k-clique. %H A370771 Andrew Gainer-Dewar, <a href="https://doi.org/10.37236/2615">Gamma-Species and the Enumeration of k-Trees</a>, Electronic Journal of Combinatorics, Volume 19 (2012), #P45. %e A370771 Triangle begins: %e A370771 1; %e A370771 1, 1; %e A370771 1, 1, 1; %e A370771 1, 2, 1, 1; %e A370771 1, 4, 2, 1, 1; %e A370771 1, 9, 6, 2, 1, 1; %e A370771 1, 20, 21, 6, 2, 1, 1; %e A370771 1, 48, 83, 25, 6, 2, 1, 1; %e A370771 1, 115, 356, 126, 25, 6, 2, 1, 1; %e A370771 1, 286, 1599, 745, 135, 25, 6, 2, 1, 1; %e A370771 1, 719, 7434, 4784, 895, 135, 25, 6, 2, 1, 1; %e A370771 ... %Y A370771 Columns k=0..2 are A000012, A000081, A058866. %Y A370771 Cf. A370770 (unrooted), A370772, A370773. %K A370771 nonn,tabl %O A370771 0,8 %A A370771 _Andrew Howroyd_, Mar 01 2024