A000836 Number of switching networks (see Harrison reference for precise definition). (Formerly M4905 N2103)

13, 87, 4148, 153668757, 41269612629126375351, 810896098877923596128062174904361421866219158

Offset

1,1

Comments

Next term has 99 digits. - Sean A. Irvine, Jan 20 2012

Number of equivalence classes with AG_n(Z_2) operating on the domain and symmetric group of 3 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..6.

Index entries for sequences related to switching networks

Crossrefs

Sequence in context: A082036 A037060 A348024 * A157771 A289137 A228481

Adjacent sequences: A000833 A000834 A000835 * A000837 A000838 A000839

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Sean A. Irvine, Jan 19 2012

Status

approved