A000817 Number of switching networks under action of GL_n(Z_2) acting on 2 variables. (Formerly M5003 N2153)

16, 80, 1056, 320416, 1858620869536, 16880173675357998942609488800, 706695723125809149019144715477884710572926078237246360174451424

Offset

1,1

Comments

See Harrison reference for precise definition.

Next term has 136 digits. - Sean A. Irvine, Jan 19 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: A165963 A221910 A069840 * A192510 A119508 A330480

Adjacent sequences: A000814 A000815 A000816 * A000818 A000819 A000820

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Sean A. Irvine, Jan 18 2012

Name clarified by Sean A. Irvine, Feb 01 2025

Status

approved