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 A378074 #7 Nov 15 2024 19:39:05 %S A378074 0,0,0,1,2,9,47,420,4673,63253,927238,14342093,229607392,3776227106, %T A378074 63482545872,1087322656758,18927037827561 %N A378074 Number of embeddings on the sphere of 2-connected homeomorphically irreducible planar graphs with n nodes. %C A378074 Homeomorphically irreducible means each vertex has a degree of at least 3. %F A378074 a(n) = A000944(n) + A187927(n). %Y A378074 Row sums of A378075. %Y A378074 Cf. A000944, A034889, A187927, A378076. %K A378074 nonn,more %O A378074 1,5 %A A378074 _Andrew Howroyd_, Nov 15 2024