0,3

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

Reference gives formula.

Sequence in context: A004343 A068767 A123512 this_sequence A079515 A024131 A000457

Adjacent sequences: A046712 A046713 A046714 this_sequence A046716 A046717 A046718

nonn,easy,more

njas