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 A324163 #12 Sep 02 2019 23:04:26 %S A324163 1,0,1,0,0,1,0,0,3,1,0,0,12,0,1,0,0,60,70,15,1,0,0,360,0,465,0,1,0,0, %T A324163 2520,19320,19355,3507,105,1,0,0,20160,0,1024380,0,30016,0,1,0,0, %U A324163 181440,11166120,66462480,66462606,11180820,286884,945,1 %N A324163 Triangle read by rows: T(n,k) is the number of connected k-regular simple graphs on n labeled vertices, (0 <= k < n). %H A324163 Andrew Howroyd, <a href="/A324163/b324163.txt">Table of n, a(n) for n = 1..210</a> %F A324163 Column k is the logarithmic transform of column k of A059441. %e A324163 Triangle begins: %e A324163 1; %e A324163 0, 1; %e A324163 0, 0, 1; %e A324163 0, 0, 3, 1; %e A324163 0, 0, 12, 0, 1; %e A324163 0, 0, 60, 70, 15, 1; %e A324163 0, 0, 360, 0, 465, 0, 1; %e A324163 0, 0, 2520, 19320, 19355, 3507, 105, 1; %e A324163 0, 0, 20160, 0, 1024380, 0, 30016, 0, 1; %e A324163 ... %Y A324163 Column k=2 is A001710(n-1) for n >= 3. %Y A324163 Column k=3 is aerated A004109. %Y A324163 Column k=4 is A272905. %Y A324163 Row sums are A322659. %Y A324163 Cf. A059441 (not necessarily connected), A068934 (unlabeled). %K A324163 nonn,tabl %O A324163 1,9 %A A324163 _Andrew Howroyd_, Sep 02 2019