A378341 Number of connected achiral planar maps with an external face and n internal triangular faces.

1, 2, 6, 16, 45, 129, 367, 1081, 3098, 9291, 26788, 81341, 235729, 722479, 2102856, 6492146, 18965527, 58898531, 172600126, 538640825, 1582733185, 4959648919, 14607576158, 45935431662, 135571479679, 427621459608, 1264356405112, 3998682343629, 11842126315245, 37540318975749

Offset

1,2

Links

Table of n, a(n) for n=1..30.

Prog

(PARI) A378341seq(30) \\ See PARI link in A378340 for program code.

Crossrefs

Column sums of A378340.

Cf. A378337, A378339, A378342.

Sequence in context: A333106 A025266 A074403 * A337318 A333070 A290953

Adjacent sequences: A378338 A378339 A378340 * A378342 A378343 A378358

Keyword

nonn,new

Author

Andrew Howroyd, Nov 25 2024

Status

approved