A378342 Number of n edge connected achiral planar maps with an external face in which all internal faces are triangles.

1, 0, 1, 2, 1, 4, 6, 7, 15, 22, 33, 59, 94, 140, 249, 388, 617, 1040, 1675, 2628, 4481, 7108, 11494, 19030, 30885, 49315, 82559, 132406, 215326, 353923, 576552, 928437, 1539504, 2485102, 4051828, 6636368, 10830526, 17524893, 28903185, 46838466, 76464837, 125019717

Offset

3,4

Links

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

Prog

(PARI) A378338seq(45) \\ See PARI link in A378340 for program code.

Crossrefs

Antidiagonal sums of A378340.

Cf. A378338 (sensed), A378339, A378341, A378343 (unsensed).

Sequence in context: A335920 A111104 A026190 * A262599 A160016 A245089

Adjacent sequences: A378339 A378340 A378341 * A378343 A378351 A378352

Keyword

nonn,new

Author

Andrew Howroyd, Nov 25 2024

Status

approved