|
|
A055352
|
|
Number of labeled mobiles (circular rooted trees) with n nodes and 5 leaves.
|
|
2
|
|
|
144, 11508, 545664, 20469456, 678857760, 21047130720, 629779328640, 18547337128320, 544474197146880, 16067754570067200, 479436489384652800, 14522782898521497600, 447847214484186316800, 14087092606079728435200
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
6,1
|
|
LINKS
|
|
|
MATHEMATICA
|
m = 20; L[x_] = Log[1 - x] + O[x]^m // Normal; A[_] = 0;
Do[A[x_] = x y - x L[A[x]] + O[x]^k // Normal // Expand, {k, m}];
Drop[(SeriesCoefficient[#, {y, 0, 5}] & /@ CoefficientList[A[x], x]) * Range[0, m - 1]!, 6] (* Jean-François Alcover, Nov 01 2019 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|