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 A378343 #6 Nov 25 2024 20:44:56 %S A378343 1,0,1,2,1,4,7,10,22,41,77,167,349,736,1642,3627,8120,18575,42548, %T A378343 97871,228166,532484,1246778,2941748,6952421,16470326,39217775, %U A378343 93530974,223542903,536138078,1287943658,3099775046,7479610688,18075710749,43755189158,106127886654,257778445136 %N A378343 Number of n edge connected unsensed planar maps with an external face in which all internal faces are triangles. %H A378343 Andrew Howroyd, <a href="/A378343/b378343.txt">Table of n, a(n) for n = 3..100</a> %F A378343 a(n) = (A378338(n) + A378342(n))/2. %o A378343 (PARI) A378343seq(30) \\ See PARI link in A378340 for program code. %Y A378343 Antidiagonal sums of A378103. %Y A378343 Cf. A377785 (by vertices), A378338 (sensed), A378342 (achiral). %K A378343 nonn %O A378343 3,4 %A A378343 _Andrew Howroyd_, Nov 25 2024