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A220873
Number of enhanced set partitions of n elements treatable by "PTR" (Procedure Triple Reverse).
0
1, 2, 5, 15, 44, 147, 439, 1484, 4469, 15217
OFFSET
1,2
LINKS
Lily Yen, A Bijection for Crossings and Nestings, arXiv preprint arXiv:1209.3082, 2012
CROSSREFS
Sequence in context: A292524 A071742 A035355 * A148351 A148352 A151463
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 27 2012
STATUS
approved