1,2

Gordon Royle asks if this is an erroneous version of A078639.

R. M. Foster, Geometrical circuits of electrical networks, Transactions of the American Institute of Electrical Engineers, 51 (1932), 309-317.

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).

Cf. A002631.

Sequence in context: A129092 A110710 A078639 this_sequence A020127 A121396 A054960

Adjacent sequences: A002629 A002630 A002631 this_sequence A002633 A002634 A002635

nonn,more

N. J. A. Sloane (njas(AT)research.att.com).