A000835 Number of switching networks (see Harrison reference for precise definition). (Formerly M4375 N1840)

7, 22, 153, 15209, 29281010032, 131876417000509741750888020, 2760530168460193185695064401186144339478505237725915631330140

Offset

1,1

Comments

Next term has 133 digits. - Sean A. Irvine, Jan 20 2012

Number of equivalence classes with AG_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: A027838 A194996 A330089 * A239028 A335638 A197991

Adjacent sequences: A000832 A000833 A000834 * A000836 A000837 A000838

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Sean A. Irvine, Jan 19 2012

Status

approved