1,2

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. A002632.

Sequence in context: A005163 A006116 A122082 this_sequence A107948 A058673 A059295

Adjacent sequences: A002628 A002629 A002630 this_sequence A002632 A002633 A002634

nonn,more,nice

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