Number of permutations of length n sortable by 6 passes through a pop-stack.

A293784

Number of permutations of length n sortable by 6 passes through a pop-stack.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =5040a(8) =35214a(9) =229378a(10) =1408522a(11) =8370900a(12) =49154431a(13) =288653307a(14) =1703668022a(15) =10115769088a(16) =60332300930a(17) =360602808068

External references