a(n)=Sum{T(n,j): j=1,2,...,n}, array T given by A048212.

Terms

a(0) =2a(1) =4a(2) =16a(3) =40a(4) =80a(5) =134a(6) =218a(7) =338a(8) =482a(9) =682a(10) =924a(11) =1212a(12) =1537a(13) =1901a(14) =2381a(15) =2909a(16) =3487a(17) =4153a(18) =4875a(19) =5695a(20) =6640a(21) =7674a(22) =8778a(23) =10050a(24) =11450a(25) =12984a(26) =14631a(27) =16367a(28) =18223a(29) =20263