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 A212438 #26 Mar 27 2021 22:49:40 %S A212438 1,0,1,1,0,1,2,2,2,0,0,2,8,11,8,5,0,0,2,11,42,74,76,38,14,0,0,0,8,74, %T A212438 296,633,768,558,219,50,0,0,0,5,76,633,2635,6134,8822,7916,4442,1404, %U A212438 233,0,0,0,0,38,768,6134,25626,64439,104213,112082,79773,36528,9714,1249 %N A212438 Irregular triangle read by rows: T(n,k) is the number of polyhedra with n faces and k vertices (n >= 4, k=4..2n-4). %C A212438 Because of duality, T(n,k) = T(k,n). - _Ivan Neretin_, May 25 2016 %C A212438 The number of edges is n+k-2. - _Andrew Howroyd_, Mar 27 2021 %H A212438 Andrew Howroyd, <a href="/A212438/b212438.txt">Table of n, a(n) for n = 4..199</a> (rows 4..17) %H A212438 Gunnar Brinkmann and Brendan McKay, <a href="https://users.cecs.anu.edu.au/~bdm/papers/plantri-full.pdf">Fast generation of planar graphs (expanded edition)</a>, Table 9-11. %H A212438 G. P. Michon, <a href="http://www.numericana.com/data/polyhedra.htm">Counting Polyhedra</a> %e A212438 Triangle begins: %e A212438 1 %e A212438 0 1 1 %e A212438 0 1 2 2 2 %e A212438 0 0 2 8 11 8 5 %e A212438 0 0 2 11 42 74 76 38 14 %e A212438 0 0 0 8 74 296 633 768 558 219 50 %e A212438 0 0 0 5 76 633 2635 6134 8822 7916 4442 1404 233 %e A212438 ... %Y A212438 A049337, A058787, A212438 are all versions of the same triangle. %Y A212438 Row sums (the same as column sums) are A000944. %Y A212438 Main diagonal is A002856. %Y A212438 Cf. A002840 (by edges), A239893. %K A212438 nonn,tabf %O A212438 4,7 %A A212438 _N. J. A. Sloane_, May 16 2012 %E A212438 Terms a(53) and beyond from _Andrew Howroyd_, Mar 27 2021