A058259 Number of split semiorders on n points.

1, 2, 5, 16, 61, 279, 1491, 9267, 66447, 545173

Offset

1,2

Links

Table of n, a(n) for n=1..10.

P. C. Fishburn and J. A. Reeds, Counting split semiorders, Order, 18(2): 119-128, 2001.

Crossrefs

Cf. A000111, A058260.

Sequence in context: A346838 A000111 A007976 * A361920 A368318 A369400

Adjacent sequences: A058256 A058257 A058258 * A058260 A058261 A058262

Keyword

nonn,hard,more,nice

Author

N. J. A. Sloane, Dec 06 2000

Status

approved