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A000827 Number of switching networks (see Harrison reference for precise definition).
(Formerly M5101 N2209)
0
20, 484, 497760, 1957701217328, 110039180295740617586514688, 1453032809117364647244136820047121806179196309892169728 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Symmetric group of n variables operating on the domain and symmetric group of 3 variables operating on the range. - Sean A. Irvine, Jul 11 2011

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..6.

Index entries for sequences related to switching networks

CROSSREFS

Sequence in context: A065412 A159753 A252975 * A241261 A118552 A270578

Adjacent sequences:  A000824 A000825 A000826 * A000828 A000829 A000830

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Sean A. Irvine, Jul 10 2011

STATUS

approved

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Last modified July 3 16:16 EDT 2022. Contains 355055 sequences. (Running on oeis4.)