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

A378341

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

Terms

    a(0) =1a(1) =2a(2) =6a(3) =16a(4) =45a(5) =129a(6) =367a(7) =1081a(8) =3098a(9) =9291a(10) =26788a(11) =81341a(12) =235729a(13) =722479a(14) =2102856a(15) =6492146a(16) =18965527a(17) =58898531a(18) =172600126a(19) =538640825a(20) =1582733185a(21) =4959648919a(22) =14607576158a(23) =45935431662a(24) =135571479679a(25) =427621459608

External references