24-hedral numbers: a(n) = (2*n + 1)*(8*n^2 + 14*n + 7).

Terms

a(0) =7a(1) =87a(2) =335a(3) =847a(4) =1719a(5) =3047a(6) =4927a(7) =7455a(8) =10727a(9) =14839a(10) =19887a(11) =25967a(12) =33175a(13) =41607a(14) =51359a(15) =62527a(16) =75207a(17) =89495a(18) =105487a(19) =123279a(20) =142967a(21) =164647a(22) =188415a(23) =214367a(24) =242599a(25) =273207a(26) =306287a(27) =341935a(28) =380247a(29) =421319