A378339 Number of n-node connected achiral planar maps with an external face in which all internal faces are triangles.
1, 2, 5, 15, 46, 139, 449, 1448, 4799, 15971, 54107, 184048, 633365, 2188644, 7624153, 26659774, 93772014, 330946542, 1173233805, 4171572088, 14884905583, 53249784377, 191043396323, 686956509123, 2476044740337, 8942288625630, 32360306616473, 117309644377341
Offset: 3
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 3..200