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A003129 Number of transfer impedances of an n-terminal network.
(Formerly M3131)
2
0, 3, 33, 270, 2025, 14868, 109851, 827508, 6397665, 50932233, 418175274, 3542883864, 30972408558, 279287247333, 2596195945977, 24862074701208, 245091667488207, 2485294443056496, 25903024863885465, 277278282774462210 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

REFERENCES

J. Riordan, The number of impedances of an n-terminal network, Bell Syst. Tech. J., 18 (1939), 300-314.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

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).

LINKS

Table of n, a(n) for n=2..21.

CROSSREFS

Cf. A003128, A003130.

Sequence in context: A195578 A206950 A189644 * A190542 A180416 A043038

Adjacent sequences:  A003126 A003127 A003128 * A003130 A003131 A003132

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 21 11:21 EST 2019. Contains 319354 sequences. (Running on oeis4.)