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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
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).
CROSSREFS
Sequence in context: A065412 A159753 A252975 * A241261 A118552 A270578
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Jul 10 2011
STATUS
approved