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A220872
Number of enhanced partial matchings of n elements treatable by "PTR" (Procedure Triple Reverse).
0
1, 1, 2, 4, 10, 25, 67, 180, 496, 1370, 3863, 10881, 31448, 90280
OFFSET
1,3
LINKS
Lily Yen, A Bijection for Crossings and Nestings, arXiv preprint arXiv:1209.3082, 2012
CROSSREFS
Sequence in context: A268321 A195981 A124500 * A317876 A124501 A124344
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 27 2012
STATUS
approved