Apéry numbers: n*C(2*n,n).

Terms

a(0) =0a(1) =2a(2) =12a(3) =60a(4) =280a(5) =1260a(6) =5544a(7) =24024a(8) =102960a(9) =437580a(10) =1847560a(11) =7759752a(12) =32449872a(13) =135207800a(14) =561632400a(15) =2326762800a(16) =9617286240a(17) =39671305740a(18) =163352435400a(19) =671560012200