1,1

See Harrison reference for precise definition.

Next term has 133 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..7.

Index entries for sequences related to switching networks

Sequence in context: A126995 A271732 A219295 * A126249 A125550 A343155

Adjacent sequences: A000817 A000818 A000819 * A000821 A000822 A000823

nonn

N. J. A. Sloane.

More terms from Sean A. Irvine, Jan 19 2012

approved