A081740 11-level labeled rooted trees with n leaves.

1, 1, 11, 176, 3696, 95986, 2967041, 106296586, 4328071506, 197304236151, 9951699489061, 550054365477936, 33053174868315877, 2144972900520659506, 149472637758381213628, 11130201727845695463914, 881841184375010602801553, 74061565980075915066583527

Offset

0,3

References

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.

Links

Alois P. Heinz, Table of n, a(n) for n = 0..360

Formula

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

Prog

(PARI) a(n)=local(X); if(n<0, 0, X=x+x*O(x^n); n!*polcoeff (exp( exp( exp( exp( exp( exp(exp(exp(exp(exp(exp(X)-1)-1)-1)-1)-1)-1)-1)-1)-1)-1), n))

Crossrefs

Cf. A000110, A000258, A000307, A000357, A001669.

Column k=10 of A144150.

Sequence in context: A230388 A027398 A305970 * A051687 A231916 A101791

Adjacent sequences: A081737 A081738 A081739 * A081741 A081742 A081743

Keyword

nonn

Author

Benoit Cloitre, Apr 23 2003

Status

approved