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%I M1190 N0460 #19 Jun 27 2015 15:07:53
%S 1,2,4,9,23,63,177,514,1527,4625,14230,44357,139779,444558,1425151,
%T 4600339,14939849,48778197,160019885,527200711
%N Another approximation to A000084(n).
%C Appears to have been calculated with very low precision. A093156 is a better version. - Pab Ter (pabrlos(AT)yahoo.com), May 11 2004
%D J. Riordan and C. E. Shannon, The number of two-terminal series-parallel networks, J. Math. Phys., 21 (1942), 83-93. Reprinted in Claude Elwood Shannon: Collected Papers, edited by N. J. A. Sloane and A. D. Wyner, IEEE Press, NY, 1993, pp. 560-570.
%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H J. Riordan and C. E. Shannon, <a href="/A000084/a000084_1.pdf">The number of two-terminal series-parallel networks</a> (annotated scanned copy)
%Y Cf. A000084, A058585.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_
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