Löschian numbers (A003136) of the form k^3+1.

Terms

a(0) =1a(1) =9a(2) =28a(3) =217a(4) =513a(5) =1332a(6) =1729a(7) =3376a(8) =5833a(9) =8001a(10) =13825a(11) =17577a(12) =19684a(13) =27001a(14) =42876a(15) =46657a(16) =54873a(17) =74089a(18) =103824a(19) =110593a(20) =132652a(21) =175617a(22) =216001a(23) =238329a(24) =250048a(25) =287497a(26) =373249a(27) =405225a(28) =421876a(29) =474553