1,1

See Harrison reference for precise definition.

Next term has 100 digits. [Sean A. Irvine, Jan 20, 2012]

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).

Table of n, a(n) for n=1..6.

Index entries for sequences related to switching networks

Sequence in context: A068075 A219004 A053136 * A250422 A223307 A244795

Adjacent sequences: A000818 A000819 A000820 * A000822 A000823 A000824

nonn

N. J. A. Sloane.

More terms from Sean A. Irvine, Jan 19 2012

approved