A378335 Number of n-node connected sensed planar maps with an external face in which all internal faces are triangles.

1, 2, 5, 23, 114, 675, 4357, 29692, 209933, 1531349, 11439545, 87202034, 676101375, 5319069978, 42378741675, 341403125204, 2777329727768, 22790623236250, 188475690185517, 1569588986566488, 13153980294670851, 110870960421707325, 939397206702263021

Offset: 3

Author

Andrew Howroyd, Nov 23 2024

Keywords

• nonn

Comments

See A377785 for illustration of initial terms. This sequence does not consider a planar map to be equivalent to its mirror image.

Links

• Andrew Howroyd, Table of n, a(n) for n = 3..200

Crossrefs

Row sums of A378336.

Cf. A262586, A377785, A378334, A378337, A378338, A378339, A378340.

Programs

PARI

A378335seq(25) \\ See PARI link in A378340 for program code.