2,2
J. Riordan, The number of impedances of an n-terminal network, Bell Syst. Tech. J., 18 (1939), 300-314.
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=2..10.
Cf. A003128, A003129.
Sequence in context: A110216 A218839 A036276 * A015000 A220225 A213376
Adjacent sequences: A003127 A003128 A003129 * A003131 A003132 A003133
nonn
N. J. A. Sloane.
approved
