OFFSET
0,3
COMMENTS
This sequence is the labeled version of A102911 where the pertinent definitions can be found.
LINKS
N. J. A. Sloane, Illustration of initial terms
EXAMPLE
a(3) = 810. In the illustrations by Sloane found in the link above, for n = 6, there are A102911(3) = 3 trees with a bicentroid: the first, second and last trees shown. They have 360, 360, and 90 labelings respectively. 360 + 360 + 90 = 810.
MATHEMATICA
Prepend[Table[Binomial[2 n, n] n^(n - 1) n^(n - 1)/2, {n, 1, 12}], 0]
CROSSREFS
KEYWORD
nonn
AUTHOR
Geoffrey Critzer, Jul 31 2022
STATUS
approved