A378334 Number of n-node connected sensed planar maps with an external face, whose internal faces are triangles and which is rooted at a node on the external face.

1, 3, 16, 88, 537, 3473, 23562, 165859, 1202919, 8941118, 67836666, 523722889, 4104244351, 32583588994, 261635413752, 2122002356439, 17364496928654, 143230857011191, 1189928600338968, 9949848535116510, 83688384576105358, 707689149415139246, 6013842677410501394

Offset: 3

Author

Andrew Howroyd, Nov 23 2024

Keywords

• nonn

Examples

			The a(4) = 3 rooted planar maps are:
    R---o    R---o      R-----o
    | \ |    | / |      | \ / |
    o---o    o---o       \ o /
                          \|/
                           o
		

Links

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

Crossrefs

Cf. A377785, A378335, A378339, A378340.

Programs

PARI

A378334seq(25) \\ See PARI link in A378340 for program code