Class numbers of Shanks' simplest cubic fields.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =4a(8) =7a(9) =4a(10) =4a(11) =4a(12) =7a(13) =4a(14) =13a(15) =7a(16) =19a(17) =7a(18) =7a(19) =7a(20) =19a(21) =19a(22) =19a(23) =16a(24) =31a(25) =19a(26) =28a(27) =19a(28) =49a(29) =31