A000826 Number of switching networks (see Harrison reference for precise definition). (Formerly M4731 N2023)

10, 88, 6616, 91666432, 76873231310808704, 236307200075982899871259747594698752, 11487310440209940035256956508459148560969989043872580978940882909553754112, 166267459448692920381622333807116147427859895760062485070882091322892520958706179582178218311954136674872641052328937320550635171107567787263574147072

Offset

1,1

Comments

Number of equivalence classes with symmetric group of n variables operating on the domain and symmetric group of 2 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..8.

Index entries for sequences related to switching networks

Crossrefs

Sequence in context: A163030 A302149 A269008 * A282555 A120923 A057081

Adjacent sequences: A000823 A000824 A000825 * A000827 A000828 A000829

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Sean A. Irvine, Jul 10 2011

Status

approved