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A339037
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Number of unlabeled connected loopless multigraphs with n edges rooted at one oriented edge.
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6
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1, 3, 11, 41, 160, 641, 2672, 11479, 50938, 232830, 1095151, 5292990, 26257328, 133548307, 695752146, 3709509938, 20224607541, 112675185837, 641016837378, 3721624588590, 22037618432547, 133023405207408, 818085097509494, 5123460267381837, 32660335570381961, 211825198708110059
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OFFSET
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1,2
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LINKS
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FORMULA
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G.f.: x*f(x)/g(x) where f(x) is the g.f. of A339065 and g(x) is the g.f. of A050535.
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MATHEMATICA
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PROG
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seq(n)={my(A=O(x*x^n)); Vec(G(2*n, x+A, [1, 1])/G(2*n, x+A, []))}
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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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