Number of permutations of length n which avoid the patterns 4213 and 1432.

A165533

Number of permutations of length n which avoid the patterns 4213 and 1432.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =87a(6) =352a(7) =1434a(8) =5861a(9) =24019a(10) =98677a(11) =406291a(12) =1676009a(13) =6924618a(14) =28646875a(15) =118638038a(16) =491765865a(17) =2039944740a(18) =8467475533a(19) =35166107745a(20) =146115418937a(21) =607353499821

External references