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%I M1868 N0740 #23 Jan 29 2022 01:05:38
%S 1,2,8,44,436,7176,222368,12376880,1302871456,254079924896,
%T 94287450368768,65986000800656832,88430997899765949952,
%U 226039101814259861321856,1112311767839787173832758784
%N Number of self-converse relations on n points.
%D F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 155, Table 6.6.1.
%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 Sean A. Irvine, <a href="/A002500/b002500.txt">Table of n, a(n) for n = 0..50</a>
%H F. Harary and E. M. Palmer, <a href="http://dx.doi.org/10.1112/S0025579300003910">Enumeration of self-converse digraphs</a>, Mathematika, 13 (1966), 151-157.
%F Equals A029849*2 - A000595. Cf. A002499.
%K nonn,nice,easy
%O 0,2
%A _N. J. A. Sloane_
%E In the Encyclopedia of Integer Sequences the n=6 term is given incorrectly as 484256.
%E Corrected and extended with formula by _Christian G. Bower_, Jun 15 1998
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