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Number of indecomposable binary relations on [n].
0

%I #5 Jul 10 2018 02:59:40

%S 1,3,57,3963,1040097

%N Number of indecomposable binary relations on [n].

%H Vincent Pilaud, Viviane Pons, <a href="https://arxiv.org/abs/1807.03277">The Hopf algebra of integer binary relations</a>, arXiv:1807.03277 [math.CO], 2018. See Table 2 p.8.

%F a(n) <= A053763(n).

%Y Cf. A053763.

%K nonn,more

%O 1,2

%A _Michel Marcus_, Jul 09 2018