A378343 Number of n edge connected unsensed planar maps with an external face in which all internal faces are triangles.

1, 0, 1, 2, 1, 4, 7, 10, 22, 41, 77, 167, 349, 736, 1642, 3627, 8120, 18575, 42548, 97871, 228166, 532484, 1246778, 2941748, 6952421, 16470326, 39217775, 93530974, 223542903, 536138078, 1287943658, 3099775046, 7479610688, 18075710749, 43755189158, 106127886654, 257778445136

Offset: 3

Author

Andrew Howroyd, Nov 25 2024

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 3..100

Crossrefs

Antidiagonal sums of A378103.

Cf. A377785 (by vertices), A378338 (sensed), A378342 (achiral).

Programs

PARI

A378343seq(30) \\ See PARI link in A378340 for program code.

Formula

a(n) = (A378338(n) + A378342(n))/2.