Column 2 of triangle A277295; a(n) = A277295(n+2,2).

A277296

Column 2 of triangle A277295; a(n) = A277295(n+2,2).

Terms

    a(0) =0a(1) =5a(2) =76a(3) =698a(4) =5088a(5) =32461a(6) =189940a(7) =1046190a(8) =5511440a(9) =28061890a(10) =139089880a(11) =674600980a(12) =3213923072a(13) =15084364221a(14) =69904629316a(15) =320443984742

External references