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 A226505 #12 Oct 09 2020 09:01:56 %S A226505 1,1,2,5,14,1,42,9,1,132,55,14,2,429,286,120,35,6,1,1430,1365,819,364, %T A226505 119,35,7,1,4862,6188,4900,2940,1394,586,203,59,13,2,16796,27132, %U A226505 26928,20400,12576,6846,3246,1358,493,153,38,8,1 %N A226505 Irregular triangle read by rows: T(n,k) = number of set partitions of [1..n] with intertwining weight k. %H A226505 B. Chern, P. Diaconis, D. M. Kane, and R. C. Rhoades, <a href="https://arxiv.org/abs/1304.4309">Closed expressions for averages of set partition statistics</a>, arXiv:1304.4309 [math.CO], 2013. %e A226505 Triangle begins: %e A226505 1 %e A226505 1 %e A226505 2 %e A226505 5 %e A226505 14 1 %e A226505 42 9 1 %e A226505 132 55 14 2 %e A226505 429 286 120 35 6 1 %e A226505 1430 1365 819 364 119 35 7 1 %e A226505 4862 6188 4900 2940 1394 586 203 59 13 2 %e A226505 16796 27132 26928 20400 12576 6846 3246 1358 493 153 38 8 1 %e A226505 ... %Y A226505 Cf. A226504. First two columns are A000108, A030053. %Y A226505 Row sums give A000110. %K A226505 nonn,tabf %O A226505 0,3 %A A226505 _N. J. A. Sloane_, Jun 10 2013