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Search: id:A003129
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| A003129 |
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Number of transfer impedances of an n-terminal network.
(Formerly M3131)
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+0
3
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| 0, 3, 33, 270, 2025, 14868, 109851, 827508, 6397665, 50932233, 418175274, 3542883864, 30972408558, 279287247333, 2596195945977, 24862074701208, 245091667488207, 2485294443056496, 25903024863885465, 277278282774462210
(list; graph; listen)
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OFFSET
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2,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
J. Riordan, The number of impedances of an n-terminal network, Bell Syst. Tech. J., 18 (1939), 300-314.
E.g.f.: (exp(x)+3)*(exp(x)-1)^3*exp(exp(x)-1)/8. a(n) = Sum_{k=0..n} Stirling2(n,k)*binomial(binomial(k,2),2).
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CROSSREFS
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Cf. A003128, A003130.
Sequence in context: A089015 A062215 A132122 this_sequence A043038 A107127 A135697
Adjacent sequences: A003126 A003127 A003128 this_sequence A003130 A003131 A003132
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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