Number of 2-stack pushall sortable permutations of length n.

A274970

Number of 2-stack pushall sortable permutations of length n.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =698a(7) =4393a(8) =28551a(9) =187403a(10) =1231517a(11) =8080058a(12) =52905865a(13) =345820994

External references