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URL: https://oeis.org/A293501

⇱ A293501 - OEIS

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A293501
Number of unlabeled semiorders on n points and having dimension 3.
0
3, 40, 318, 1974, 10603, 51894, 238413, 1047440, 4454826, 18496217, 75416600, 303287250, 1206781482, 4762466651, 18674965709, 72866587238, 283217927396, 1097537249485, 4243554109115, 16379413110981, 63142882465324, 243203630272390
OFFSET
7,1
LINKS
Mitchel T. Keller, Stephen J. Young, Hereditary Semiorders and Enumeration of Semiorders by Dimension, arXiv:1801.00501 [math.CO], 2018.
FORMULA
a(n) = A000108(n) - A293498(n).
CROSSREFS
Sequence in context: A181395 A165395 A165386 * A002700 A220639 A355373
KEYWORD
nonn
AUTHOR
Mitchel T. Keller, Oct 10 2017
STATUS
approved