a(n) = [ (n+2)/(n-1) ] + [ (n+4)/(n-2) ] + ... + [ (3n-2)/1 ].

Terms

a(0) =4a(1) =9a(2) =16a(3) =22a(4) =30a(5) =38a(6) =47a(7) =54a(8) =65a(9) =73a(10) =85a(11) =91a(12) =104a(13) =114a(14) =125a(15) =134a(16) =145a(17) =157a(18) =170a(19) =178a(20) =192a(21) =200a(22) =217a(23) =225a(24) =238a(25) =251a(26) =264a(27) =272a(28) =289a(29) =299