Number of permutations of [n] with every alternating run of length less than 3 in which the last alternating run has length 2.

A246014

Number of permutations of [n] with every alternating run of length less than 3 in which the last alternating run has length 2.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =16a(6) =70a(7) =385a(8) =2365a(9) =16337a(10) =125870a(11) =1064810a(12) =9829820a(13) =98319221a(14) =1058927507a(15) =12220050571a(16) =150421002736

External references