A260041 Number of twin-tree-rooted maps with n edges.

0, 1, 9, 88, 935, 10576, 125398, 1541842, 19510569, 252692488, 3336041258, 44754332228, 608627917092, 8374308526624, 116400823021244, 1632397871933462, 23073139088034053, 328412887616247352, 4703787284447392654, 67751302345297146628, 980837632950784897364

Offset

0,3

Links

Table of n, a(n) for n=0..20.

R. C. Mullin, On the average activity of a spanning tree of a rooted map, J. Combin. Theory, 3 (1967), 103-121.

R. C. Mullin, On the average activity of a spanning tree of a rooted map, J. Combin. Theory, 3 (1967), 103-121. [Annotated scanned copy]

Crossrefs

Row sums of A260040.

Sequence in context: A362509 A015583 A152266 * A084022 A084015 A231155

Adjacent sequences: A260038 A260039 A260040 * A260042 A260043 A260044

Keyword

nonn

Author

N. J. A. Sloane, Jul 22 2015

Status

approved