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

3,2

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

Prog

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

Crossrefs

Row sums of A378336.

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

Sequence in context: A249606 A003501 A006990 * A358608 A242227 A032182

Adjacent sequences: A378332 A378333 A378334 * A378336 A378337 A378338

Keyword

nonn

Author

Andrew Howroyd, Nov 23 2024

Status

approved