The number of 2-noncrossing permutations of n elements.

A169584

The number of 2-noncrossing permutations of n elements.

Terms

    a(0) =1a(1) =10a(2) =76a(3) =543a(4) =3904a(5) =29034a(6) =225753a(7) =1839540a(8) =15679886a(9) =139301291a(10) =1284533342a(11) =12245397495a(12) =120245889336

External references