A000839 Number of n-input 3-output switching networks under action of complementing group on the inputs and outputs. (Formerly M4577 N1951)

8, 176, 265728, 2199038984192, 309485009821617747608469504, 12259964326927110866866776295192695943928870296113643520

Offset

1,1

Comments

a(n) = 2^(3*(2^n-1) - n) + 2^(2^n + 2^(n-1)) - 2^(2^n + 2^(n-1) - n). - Sean A. Irvine, Jul 14 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..6.

Index entries for sequences related to switching networks

Crossrefs

Cf. A000133, A000838.

Sequence in context: A064342 A251578 A099175 * A001596 A221115 A159326

Adjacent sequences: A000836 A000837 A000838 * A000840 A000841 A000842

Keyword

easy,nonn

Author

N. J. A. Sloane

Extensions

More terms from Vladeta Jovovic, Feb 26 2000

Status

approved