A289713 The order of the semigroup of orientation-preserving partial transformations on n elements.
1, 2, 9, 61, 449, 3161, 21145, 136529, 862209, 5369617, 33133481, 203119577, 1239049729, 7528608985, 45596026169, 275385806881, 1659295498241, 9977108934689, 59881303252297, 358815987469673, 2146943650081281, 12829239786138217, 76571416493573849, 456525052642949681
Offset: 0
Links
- A. Umar, Combinatorial Results for Semigroups of Orientation-Preserving Partial Transformations, J. Int. Seq. 14 (2011) # 11.7.5, Tables 2.1, 2.2 and 2.3.
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