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A000889 Number of switching networks with S(n) and C(2,2) acting on the domain and AG(2,2) acting on the range.
(Formerly M1819 N0722)
0
2, 7, 124, 494298, 200221917406630, 307691667840351694566029898844575, 7478717734511679718967611872518416516838871889762225738677912465064319 (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

M. A. Harrison, On the number of classes of (n,k) switching networks, University of Michigan (1962).

CROSSREFS

Sequence in context: A292433 A338181 A337764 * A323597 A286423 A041727

Adjacent sequences:  A000886 A000887 A000888 * A000890 A000891 A000892

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Sean A. Irvine, Jan 26 2012

STATUS

approved

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Last modified October 19 03:10 EDT 2021. Contains 348073 sequences. (Running on oeis4.)