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A000357 Number of 5-level labeled rooted trees with n leaves.
(Formerly M3979 N1648)
1, 1, 5, 35, 315, 3455, 44590, 660665, 11035095, 204904830, 4183174520, 93055783320, 2238954627848, 57903797748386, 1601122732128779, 47120734323344439, 1470076408565099152, 48449426629560437576, 1681560512531504058350, 61293054886119796799892 (list; graph; refs; listen; history; text; internal format)



J. Ginsburg, Iterated exponentials, Scripta Math., 11 (1945), 340-353.

T. Hogg and B. A. Huberman, Attractors on finite sets: the dissipative dynamics of computing structures, Phys. Review A 32 (1985), 2338-2346.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


Alois P. Heinz, Table of n, a(n) for n = 0..400

P. J. Cameron, Sequences realized by oligomorphic permutation groups, J. Integ. Seqs. Vol. 3 (2000), #00.1.5.

Jekuthiel Ginsburg, Iterated exponentials, Scripta Math., 11 (1945), 340-353. [Annotated scanned copy]

Gottfried Helms, Bell Numbers, 2008.

T. Hogg and B. A. Huberman, Attractors on finite sets: the dissipative dynamics of computing structures,  Phys. Review A 32 (1985), 2338-2346. (Annotated scanned copy)

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 294

Index entries for sequences related to rooted trees


E.g.f.: exp(exp(exp(exp(exp(x)-1)-1)-1)-1).


g:= proc(p) local b; b:=proc(n) option remember; if n=0 then 1 else (n-1)! *add(p(k)*b(n-k)/ (k-1)!/ (n-k)!, k=1..n) fi end end: a:= g(g(g(g(1)))): seq(a(n), n=0..30);  # Alois P. Heinz, Sep 11 2008


max = 17; Join[{1}, MatrixPower[Array[StirlingS2, {max, max}], 5][[All, 1]]] (* Jean-Fran├žois Alcover, Mar 03 2014 *)


a(n)=|A039813(n,1)| (first column of triangle).

Cf. A000110, A000258, A000307, A000405, A001669.

Column k=4 of A144150.

Sequence in context: A225177 A151344 A015683 * A102147 A051577 A124564

Adjacent sequences:  A000354 A000355 A000356 * A000358 A000359 A000360




N. J. A. Sloane.


Extended with new description by Christian G. Bower, Aug 15 1998



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Last modified November 20 00:42 EST 2017. Contains 294957 sequences.