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%I #12 Sep 16 2024 12:54:16
%S 0,0,1,10,136,2711,79504,3405382,211055975,18749246912,2365988624260,
%T 420564361630293,104490620009920522,36030665275081893690,
%U 17132727719926060775277,11169098098145556139435182,9930583626219881751366237516,11985408843042557809380587456695,19553143146433198202168306753032180
%N Number of quasi-orders on an n-set that are not partial orders.
%F a(n) = A000798(n) - A001035(n).
%t a[n_]:=Part[ResourceFunction["OEISSequence"]["A000798"],n+1]-Part[ResourceFunction["OEISSequence"]["A001035"],n+1]; Array[a,18,0] (* _Stefano Spezia_, Sep 08 2024 *)
%Y Cf. A000798, A001035.
%K nonn
%O 0,4
%A _Firdous Ahmad Mala_, Sep 08 2024