A058259 - OEIS

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A058259

Number of split semiorders on n points.

2

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

(list; graph; refs; listen; history; text; internal format)

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