Centered 14-gonal numbers.

Terms

a(0) =1a(1) =15a(2) =43a(3) =85a(4) =141a(5) =211a(6) =295a(7) =393a(8) =505a(9) =631a(10) =771a(11) =925a(12) =1093a(13) =1275a(14) =1471a(15) =1681a(16) =1905a(17) =2143a(18) =2395a(19) =2661a(20) =2941a(21) =3235a(22) =3543a(23) =3865a(24) =4201a(25) =4551a(26) =4915a(27) =5293a(28) =5685a(29) =6091