Odd heptagonal numbers (A000566).

Terms

a(0) =1a(1) =7a(2) =55a(3) =81a(4) =189a(5) =235a(6) =403a(7) =469a(8) =697a(9) =783a(10) =1071a(11) =1177a(12) =1525a(13) =1651a(14) =2059a(15) =2205a(16) =2673a(17) =2839a(18) =3367a(19) =3553a(20) =4141a(21) =4347a(22) =4995a(23) =5221a(24) =5929a(25) =6175a(26) =6943a(27) =7209a(28) =8037a(29) =8323