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%I #10 Apr 21 2016 03:54:38
%S 1,2,5,16,61,279,1491,9267,66447,545173
%N Number of split semiorders on n points.
%H P. C. Fishburn and J. A. Reeds, <a href="http://dx.doi.org/10.1023/A:1011967426437">Counting split semiorders</a>, Order, 18(2): 119-128, 2001.
%Y Cf. A000111, A058260.
%K nonn,hard,more,nice
%O 1,2
%A _N. J. A. Sloane_, Dec 06 2000
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