a(n)=T(n,n+3), array T as in A048149.

Terms

a(0) =11a(1) =19a(2) =30a(3) =43a(4) =62a(5) =81a(6) =104a(7) =133a(8) =162a(9) =193a(10) =230a(11) =267a(12) =310a(13) =359a(14) =406a(15) =459a(16) =510a(17) =571a(18) =630a(19) =695a(20) =764a(21) =829a(22) =910a(23) =983a(24) =1064a(25) =1145a(26) =1230a(27) =1325a(28) =1414a(29) =1513