a(n)=Sum{T(n,j): j=1,2,...,n}, array T given by A048201.

Terms

a(0) =1a(1) =5a(2) =17a(3) =37a(4) =77a(5) =137a(6) =235a(7) =355a(8) =499a(9) =709a(10) =951a(11) =1251a(12) =1589a(13) =1981a(14) =2476a(15) =3020a(16) =3615a(17) =4263a(18) =4985a(19) =5785a(20) =6667a(21) =7679a(22) =8783a(23) =9959a(24) =11209a(25) =12587a(26) =14126a(27) =15806a(28) =17604a(29) =19524