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A063786
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G.f.: A(x) = (x-2*x^2-2*x^3-(1+x)*sqrt(1-4*x^2)+sqrt(1-4*x^6))/(2*x^2).
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1
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1, 1, 1, 2, 5, 5, 14, 14, 41, 42, 132, 132, 429, 429, 1428, 1430, 4862, 4862, 16796, 16796, 58781, 58786, 208012, 208012, 742900, 742900, 2674426, 2674440, 9694845, 9694845, 35357670, 35357670, 129644748, 129644790, 477638700, 477638700
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OFFSET
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2,4
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REFERENCES
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F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 78, (3.5.30). ( A(x) = s_1 bar (x) ).
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LINKS
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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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