A000832 Number of switching networks (see Harrison reference for precise definition). (Formerly M4706 N2011)

10, 46, 556, 160948, 929312039044, 8440086837679170219118159556, 353347861562904574509572357738975845669311200577543225891351084

Offset

1,1

Comments

Next term has 136 digits. - Sean A. Irvine, Jan 20 2012

Number of equivalence classes with GL_n(Z_2) operating on the domain and symmetric group of 2 variables operating on the range. - Sean A. Irvine, Jan 20 2012

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

Sequence in context: A138041 A351901 A219597 * A242462 A253477 A143895

Adjacent sequences: A000829 A000830 A000831 * A000833 A000834 A000835

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Sean A. Irvine, Jan 19 2012

Status

approved