The icosagen sequence : a(n) = A018227(n)-5, for n >= 2.

Terms

a(0) =5a(1) =13a(2) =31a(3) =49a(4) =81a(5) =113a(6) =163a(7) =213a(8) =285a(9) =357a(10) =455a(11) =553a(12) =681a(13) =809a(14) =971a(15) =1133a(16) =1333a(17) =1533a(18) =1775a(19) =2017a(20) =2305a(21) =2593a(22) =2931a(23) =3269a(24) =3661a(25) =4053a(26) =4503a(27) =4953a(28) =5465a(29) =5977