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 A259971 #13 Jan 08 2021 07:44:32 %S A259971 1,1,1,2,5,3,10,40,51,21,122,644,1236,1029,315,3346,21496,54060,66780, %T A259971 40635,9765,196082,1471460,4527228,7328580,6596100,3134565,615195 %N A259971 Triangle read by rows: coefficients xi(n,k) arising from the study of completely transitive graphs on n nodes. %H A259971 E. Andresen, K. Kjeldsen, <a href="http://dx.doi.org/10.1016/0012-365X(76)90054-6">On certain subgraphs of a complete transitively directed graph</a>, Discrete Math. 14 (1976), no. 2, 103-119. %H A259971 Hsien-Kuei Hwang, Emma Yu Jin, Michael J. Schlosser, <a href="https://arxiv.org/abs/2012.13570">Asymptotics and statistics on Fishburn Matrices: dimension distribution and a conjecture of Stoimenow</a>, arXiv:2012.13570 [math.CO], Dec 25 2020, p. 29. %e A259971 Triangle begins: %e A259971 1, %e A259971 1,1, %e A259971 2,5,3, %e A259971 10,40,51,21, %e A259971 122,644,1236,1029,315, %e A259971 3346,21496,54060,66780,40635,9765, %e A259971 196082,1471460,4527228,7328580,6596100,3134565,615195, %e A259971 ... %Y A259971 Cf. A259971, A259970. %Y A259971 Diagonals include A005321, A005330 %Y A259971 Row sums are also A005321. %K A259971 nonn,more,tabl %O A259971 1,4 %A A259971 _N. J. A. Sloane_, Jul 11 2015