Number of permutations of length n which avoid the patterns 1423, 2134, 3214.

A116764

Number of permutations of length n which avoid the patterns 1423, 2134, 3214.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =21a(4) =74a(5) =257a(6) =886a(7) =3050a(8) =10505a(9) =36206a(10) =124833a(11) =430474a(12) =1484526a(13) =5119597a(14) =17655746a(15) =60888801a(16) =209985534a(17) =724171922a(18) =2497434881a(19) =8612847430a(20) =29702935745a(21) =102435859346a(22) =353268294998

External references