Integer nearest nx, where x = sqrt(6).

Terms

a(0) =0a(1) =2a(2) =5a(3) =7a(4) =10a(5) =12a(6) =15a(7) =17a(8) =20a(9) =22a(10) =24a(11) =27a(12) =29a(13) =32a(14) =34a(15) =37a(16) =39a(17) =42a(18) =44a(19) =47a(20) =49a(21) =51a(22) =54a(23) =56a(24) =59a(25) =61a(26) =64a(27) =66a(28) =69a(29) =71