Column 2 of triangle A185755.

A185757

Column 2 of triangle A185755.

Terms

    a(0) =6a(1) =120a(2) =2340a(3) =49315a(4) =1142932a(5) =29141994a(6) =814059798a(7) =24779916843a(8) =817506518829

External references