a(n)=T(n+2,n), array T given by A048212.

Terms

a(0) =4a(1) =10a(2) =18a(3) =27a(4) =39a(5) =54a(6) =70a(7) =90a(8) =112a(9) =136a(10) =161a(11) =187a(12) =219a(13) =252a(14) =286a(15) =323a(16) =361a(17) =402a(18) =447a(19) =494a(20) =542a(21) =595a(22) =651a(23) =710a(24) =771a(25) =833a(26) =897a(27) =965a(28) =1034a(29) =1108