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A055342 Number of mobiles (circular rooted trees) with n nodes and 4 leaves. 1
1, 4, 16, 46, 118, 260, 527, 985, 1741, 2918, 4701, 7299, 11004, 16142, 23148, 32502, 44823, 60786, 81238, 107098, 139492, 179632, 228979, 289097, 361841, 449188, 553453, 677093, 822954, 994044, 1193814, 1425902, 1694445, 2003790 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..38.

Index entries for sequences related to mobiles

FORMULA

Conjecture: G.f. x^5*( -1-x-5*x^2-6*x^3-9*x^4-5*x^5-2*x^6-2*x^7+x^9 ) / ( (x^2+1)*(1+x+x^2) *(1+x)^3 *(x-1)^7 ). - R. J. Mathar, Sep 18 2011

CROSSREFS

Column 4 of A055340.

Sequence in context: A159940 A000704 A007315 * A213292 A174836 A244252

Adjacent sequences:  A055339 A055340 A055341 * A055343 A055344 A055345

KEYWORD

nonn

AUTHOR

Christian G. Bower, May 14 2000

STATUS

approved

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Last modified July 10 00:25 EDT 2020. Contains 335570 sequences. (Running on oeis4.)