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A055365 Number of asymmetric mobiles (circular rooted trees) with n nodes and 4 leaves. 1
1, 5, 19, 53, 130, 280, 556, 1024, 1788, 2971, 4752, 7338, 11013, 16099, 23020, 32249, 44390, 60109, 80234, 105670, 137520, 176979, 225479, 284562, 356049, 441890, 544360, 665883, 809258, 977455, 1173871, 1402098, 1666212, 1970508 (list; graph; refs; listen; history; internal format)
OFFSET

6,2

LINKS

Index entries for sequences related to mobiles

FORMULA

Conjecture: G.f. x^6*( -1-2*x-5*x^2-5*x^3-7*x^4-5*x^5-3*x^6-x^7-x^8 ) / ( (x^2+1)*(1+x+x^2)*(1+x)^3*(x-1)^7 ). - R. J. Mathar, Sep 18 2011

CROSSREFS

Column 4 of A055363.

Sequence in context: A100104 A015650 A200764 * A060100 A053733 A032194

Adjacent sequences:  A055362 A055363 A055364 * A055366 A055367 A055368

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), May 16 2000

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.