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 A347678 #22 Oct 20 2021 21:16:26 %S A347678 1,1,2,1,6,6,1,12,32,22,1,20,100,172,92,1,30,240,744,956,422,1,42,490, %T A347678 2364,5328,5492,2074,1,56,896,6174,21236,37618,32490,10754,1,72,1512, %U A347678 14056,68030,181140,264612,197144,58202,1,90,2400,28896,186462,690444,1497544,1863222,1222642,326240 %N A347678 Triangle read by rows: T(n,k) (1 <= k <= n) = number of n X k Baxter matrices in which all row sums are 1. %H A347678 Don Knuth, <a href="https://cs.stanford.edu/~knuth/papers/baxter-matrices.pdf">Baxter matrices</a>, Preprint, Sep 05 2021. %H A347678 George Spahn, <a href="https://arxiv.org/abs/2110.09688">Counting Baxter Matrices</a>, arXiv:2110.09688 [math.CO], 2021. %Y A347678 The main diagonal is A001181. %Y A347678 Cf. A347679. %K A347678 nonn,tabl %O A347678 1,3 %A A347678 _N. J. A. Sloane_, Sep 10 2021 %E A347678 a(29)-a(55) from _Michael S. Branicky_, Sep 17 2021