Number of 2143-avoiding Dumont paths of the 2nd kind of length 2n.
A123922
Number of 2143-avoiding Dumont paths of the 2nd kind of length 2n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =84a(6) =360a(7) =1650a(8) =7865a(9) =39039a(10) =198744a(11) =1039584a(12) =5534928a(13) =30046752a(14) =165257136a(15) =922280634a(16) =5199131025a(17) =29644168125a(18) =170375955750a(19) =988180543350
External references
- oeis: A123922