a(n) = ChebyshevT(3, n).

Terms

a(0) =0a(1) =1a(2) =26a(3) =99a(4) =244a(5) =485a(6) =846a(7) =1351a(8) =2024a(9) =2889a(10) =3970a(11) =5291a(12) =6876a(13) =8749a(14) =10934a(15) =13455a(16) =16336a(17) =19601a(18) =23274a(19) =27379a(20) =31940a(21) =36981a(22) =42526a(23) =48599a(24) =55224a(25) =62425a(26) =70226a(27) =78651a(28) =87724a(29) =97469