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A316664
Number of indecomposable binary relations on [n].
0
1, 3, 57, 3963, 1040097
OFFSET
1,2
LINKS
Vincent Pilaud, Viviane Pons, The Hopf algebra of integer binary relations, arXiv:1807.03277 [math.CO], 2018. See Table 2 p.8.
FORMULA
a(n) <= A053763(n).
CROSSREFS
Cf. A053763.
Sequence in context: A000281 A350306 A377651 * A086220 A127263 A134723
KEYWORD
nonn,more
AUTHOR
Michel Marcus, Jul 09 2018
STATUS
approved