Oblong numbers of the form (k-1)*k where k is the product of an even number of distinct primes.

Terms

a(0) =0a(1) =30a(2) =90a(3) =182a(4) =210a(5) =420a(6) =462a(7) =650a(8) =1056a(9) =1122a(10) =1190a(11) =1406a(12) =1482a(13) =2070a(14) =2550a(15) =2970a(16) =3192a(17) =3306a(18) =3782a(19) =4160a(20) =4692a(21) =5402a(22) =5852a(23) =6642a(24) =7140a(25) =7310a(26) =7482a(27) =8190a(28) =8556a(29) =8742