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%I #4 Oct 14 2021 18:06:02
%S 1,2,8,26,100
%N a(n) = Sum_{k = 1..floor(n/2)} A003041(n-2*k).
%H H. Sharp, Jr., <a href="https://doi.org/10.1016/0012-365X(73)90081-2">Enumeration of vacuously transitive relations</a>, Discrete Math. 4 (1973), 185-196.
%Y Cf. A003041.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Oct 13 2021
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