30-gonal numbers: a(n) = n*(14*n-13).

Terms

a(0) =0a(1) =1a(2) =30a(3) =87a(4) =172a(5) =285a(6) =426a(7) =595a(8) =792a(9) =1017a(10) =1270a(11) =1551a(12) =1860a(13) =2197a(14) =2562a(15) =2955a(16) =3376a(17) =3825a(18) =4302a(19) =4807a(20) =5340a(21) =5901a(22) =6490a(23) =7107a(24) =7752a(25) =8425a(26) =9126a(27) =9855a(28) =10612a(29) =11397