A000844 Number of switching networks (see Harrison reference for precise definition). (Formerly M3559 N1441)

4, 19, 556, 2945786, 1201330980739424, 1846150007042109336331740689419264, 44872306407070078313805671235110493948692333391216774983943586135973888

Offset

1,1

Comments

Number of equivalence classes with permutation and complementation of n variables on the domain and complementation of 2 variables on the range. - Sean A. Irvine, Aug 07 2011

References

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.

M. A. Harrison, On the number of classes of switching networks, Technical Note, ORA Project 04879, University of Michigan, 1962.

M. A. Harrison, On the number of classes of switching networks, J. Franklin Instit., 276 (1963), 313-327.

Index entries for sequences related to switching networks

Crossrefs

Sequence in context: A112958 A080991 A385384 * A000863 A291947 A023994

Adjacent sequences: A000841 A000842 A000843 * A000845 A000846 A000847

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Sean A. Irvine, Aug 07 2011

Status

approved