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A121094
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Isomers of polyenes attached to benzene (see Cyvin et al. for precise definition).
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0
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0, 1, 2, 2, 8, 9, 26, 28, 88, 89, 292, 297, 994, 1001, 3418, 3430, 11920, 11934, 41944, 41990, 149184, 149221, 534756, 534888, 1931394, 1931540, 7019976, 7020391, 25662396, 25662825, 94285650, 94287120, 347992480, 347993868
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OFFSET
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0,3
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LINKS
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MAPLE
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U0 := (1-sqrt(1-4*x))/2/x ;
V0 := 1+x*subs(x=x^2, U0) ;
Mb := ( subs(x=x^2, U0)^3 -subs(x=x^4, U0)*subs(x=x^2, V0) -subs(x=x^6, U0) +subs(x=x^6, V0) )/2 ; # (20)
Ma := ( subs(x=x^2, U0)^2*V0^2 -subs(x=x^3, V0)^2 -subs(x=x^4, U0)*subs(x=x^2, V0) +subs(x=x^6, V0) )/2 ; # (21)
M := Mb+Ma ;
taylor(%, x=0, 40) ;
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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