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A000841 Number of n-input 2-output switching networks under action of symmetric group S(n) on the inputs and complementing group C(2,2) on the outputs.
(Formerly M3675 N1498)
1
4, 40, 3264, 45826304, 38436615422689280, 118153600037991449448840725115437056, 5743655220104970017628478254229574276569046648639726053254944342556016640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

M. A. Harrison, On the number of classes of switching networks, J. Franklin Instit., 276 (1963), 313-327.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

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

LINKS

Table of n, a(n) for n=1..7.

Index entries for sequences related to switching networks

CROSSREFS

Cf. A000612, A000842.

Sequence in context: A292814 A303124 A072445 * A059918 A296101 A002677

Adjacent sequences:  A000838 A000839 A000840 * A000842 A000843 A000844

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vladeta Jovovic, Feb 26 2000

STATUS

approved

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Last modified April 19 15:00 EDT 2021. Contains 343116 sequences. (Running on oeis4.)