Enneagonal numbers divisible by 9.

Terms

a(0) =0a(1) =9a(2) =261a(3) =396a(4) =1089a(5) =1350a(6) =2484a(7) =2871a(8) =4446a(9) =4959a(10) =6975a(11) =7614a(12) =10071a(13) =10836a(14) =13734a(15) =14625a(16) =17964a(17) =18981a(18) =22761a(19) =23904a(20) =28125a(21) =29394a(22) =34056a(23) =35451a(24) =40554a(25) =42075a(26) =47619a(27) =49266a(28) =55251a(29) =57024