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 A378341 #5 Nov 25 2024 20:45:28 %S A378341 1,2,6,16,45,129,367,1081,3098,9291,26788,81341,235729,722479,2102856, %T A378341 6492146,18965527,58898531,172600126,538640825,1582733185,4959648919, %U A378341 14607576158,45935431662,135571479679,427621459608,1264356405112,3998682343629,11842126315245,37540318975749 %N A378341 Number of connected achiral planar maps with an external face and n internal triangular faces. %o A378341 (PARI) A378341seq(30) \\ See PARI link in A378340 for program code. %Y A378341 Column sums of A378340. %Y A378341 Cf. A378337, A378339, A378342. %K A378341 nonn %O A378341 1,2 %A A378341 _Andrew Howroyd_, Nov 25 2024