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A121092 Isomers of polyenes attached to benzene (see Cyvin et al. for precise definition). 1

%I

%S 1,1,4,11,41,141,533,1952,7320,27287,102322,383616,1442145,5428213,

%T 20472232,77333718,292638204,1109160702,4210704579,16009469632,

%U 60959141474,232440067211,887498464664,3392984209344,12987589660706

%N Isomers of polyenes attached to benzene (see Cyvin et al. for precise definition).

%H B. N. Cyvin, E. Brendsdal, J. Brunvoll and S. J. Cyvin, <a href="https://hrcak.srce.hr/176546">Isomers of polyenes attached to benzene</a>, Croatica Chemica Acta, 68 (1995), 63-73.

%p ( 12*(1-x^2-2*x^3) -(1-4*x+3*x^2)*sqrt(1-4*x) -(7+6*x)*(1-x^2)*sqrt(1-4*x^2) -2*sqrt(1-4*x^3) -2*sqrt(1-4*x^6) )/24/x^6 ;

%p taylor(%,x=0,31) ;

%p gfun[seriestolist](%) ; # _R. J. Mathar_, Jul 25 2019

%K nonn

%O 0,3

%A _N. J. A. Sloane_, Aug 11 2006

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Last modified January 25 16:42 EST 2020. Contains 331245 sequences. (Running on oeis4.)