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 A334546 #8 May 06 2020 01:49:28 %S A334546 1,1,1,1,1,0,1,1,1,0,1,1,2,0,0,1,1,3,2,0,0,1,1,4,4,2,0,0,1,1,5,9,12,2, %T A334546 0,0,1,1,6,14,37,22,2,0,0,1,1,7,23,93,146,68,2,0,0,1,1,8,32,203,602, %U A334546 772,166,2,0,0,1,1,9,46,399,2126,5847,4449,534,2,0,0 %N A334546 Array read by antidiagonals: T(n,k) is the number of unlabeled connected loopless multigraphs with n nodes of degree k or less. %C A334546 This sequence may be derived from A333893 by inverse Euler transform. %H A334546 Andrew Howroyd, <a href="/A334546/b334546.txt">Table of n, a(n) for n = 0..377</a> (antidiagonals 0..26) %F A334546 Column k is the inverse Euler transform of column k of A333893. %e A334546 Array begins: %e A334546 ============================================== %e A334546 n\k | 0 1 2 3 4 5 6 7 %e A334546 ----+----------------------------------------- %e A334546 0 | 1 1 1 1 1 1 1 1 ... %e A334546 1 | 1 1 1 1 1 1 1 1 ... %e A334546 2 | 0 1 2 3 4 5 6 7 ... %e A334546 3 | 0 0 2 4 9 14 23 32 ... %e A334546 4 | 0 0 2 12 37 93 203 399 ... %e A334546 5 | 0 0 2 22 146 602 2126 6308 ... %e A334546 6 | 0 0 2 68 772 5847 34126 164965 ... %e A334546 7 | 0 0 2 166 4449 66289 716141 6021463 ... %e A334546 ... %Y A334546 Columns k=3..5 are A243391, A289157, A334547. %Y A334546 Main diagonal is A334546. %Y A334546 Cf. A289987, A328682 (regular), A333893 (not necessarily connected). %K A334546 nonn,tabl %O A334546 0,13 %A A334546 _Andrew Howroyd_, May 05 2020