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 A126886 #8 Mar 22 2024 08:55:29 %S A126886 1,1,1,1,1,1,1,2,1,1,1,2,5,6,8,7,7,5,5,3,2,1,1,1,2,7,12,23,30,42,47, %T A126886 55,53,53,45,40,29,23 %N A126886 Triangle read by rows, arising in enumeration of 4-trees by diameter. %C A126886 See reference for precise definition. %H A126886 A. T. Balaban, J. W. Kennedy and L. V. Quintas, <a href="http://dx.doi.org/10.1021/ed065p304">The number of alkanes having n carbons and a longest chain of length d</a>, J. Chem. Education, 65 (1988), 304-313. %e A126886 Triangle begins: %e A126886 1 %e A126886 1 %e A126886 1 1 1 %e A126886 1 1 2 1 1 %e A126886 1 2 5 6 8 7 7 5 5 3 2 1 1 %e A126886 1 2 7 12 23 30 42 47 55 53 53 45 40 29 23 ... %Y A126886 Cf. A000602 (diagonal sums when rows are displaced by the appropriate amounts), A036437. %K A126886 nonn,tabf %O A126886 0,8 %A A126886 _N. J. A. Sloane_, Aug 04 2007