Number of partial matchings of n elements treatable by "PTR" (Procedure Triple Reverse).
A220871
Number of partial matchings of n elements treatable by "PTR" (Procedure Triple Reverse).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =76a(7) =232a(8) =756a(9) =2548a(10) =8906a(11) =31846a(12) =116422a(13) =432758a(14) =1634944
External references
- oeis: A220871