Numbers of the form (4k+3)^2-8 or (4k+5)^2+4.

Terms

a(0) =1a(1) =29a(2) =41a(3) =85a(4) =113a(5) =173a(6) =217a(7) =293a(8) =353a(9) =445a(10) =521a(11) =629a(12) =721a(13) =845a(14) =953a(15) =1093a(16) =1217a(17) =1373a(18) =1513a(19) =1685a(20) =1841a(21) =2029a(22) =2201a(23) =2405a(24) =2593a(25) =2813a(26) =3017a(27) =3253a(28) =3473a(29) =3725