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 A378335 #9 Nov 25 2024 16:29:17 %S A378335 1,2,5,23,114,675,4357,29692,209933,1531349,11439545,87202034, %T A378335 676101375,5319069978,42378741675,341403125204,2777329727768, %U A378335 22790623236250,188475690185517,1569588986566488,13153980294670851,110870960421707325,939397206702263021 %N A378335 Number of n-node connected sensed planar maps with an external face in which all internal faces are triangles. %C A378335 See A377785 for illustration of initial terms. This sequence does not consider a planar map to be equivalent to its mirror image. %H A378335 Andrew Howroyd, <a href="/A378335/b378335.txt">Table of n, a(n) for n = 3..200</a> %o A378335 (PARI) A378335seq(25) \\ See PARI link in A378340 for program code. %Y A378335 Row sums of A378336. %Y A378335 Cf. A262586, A377785, A378334, A378337, A378338, A378339, A378340. %K A378335 nonn %O A378335 3,2 %A A378335 _Andrew Howroyd_, Nov 23 2024