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A260041 Number of twin-tree-rooted maps with n edges. 1
0, 1, 9, 88, 935, 10576, 125398, 1541842, 19510569, 252692488, 3336041258, 44754332228, 608627917092, 8374308526624, 116400823021244, 1632397871933462, 23073139088034053, 328412887616247352, 4703787284447392654, 67751302345297146628, 980837632950784897364 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
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
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 22 2015
STATUS
approved

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Last modified February 27 15:09 EST 2024. Contains 370376 sequences. (Running on oeis4.)