Coinage sequence: a(n) = A018227(n)-7.

Terms

a(0) =3a(1) =11a(2) =29a(3) =47a(4) =79a(5) =111a(6) =161a(7) =211a(8) =283a(9) =355a(10) =453a(11) =551a(12) =679a(13) =807a(14) =969a(15) =1131a(16) =1331a(17) =1531a(18) =1773a(19) =2015a(20) =2303a(21) =2591a(22) =2929a(23) =3267a(24) =3659a(25) =4051a(26) =4501a(27) =4951a(28) =5463a(29) =5975