A316664 Number of indecomposable binary relations on [n].

1, 3, 57, 3963, 1040097

Offset

1,2

Links

Table of n, a(n) for n=1..5.

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

Adjacent sequences: A316661 A316662 A316663 * A316665 A316666 A316667

Keyword

nonn,more

Author

Michel Marcus, Jul 09 2018

Status

approved