Squarefree oblong numbers.

Terms

a(0) =2a(1) =6a(2) =30a(3) =42a(4) =110a(5) =182a(6) =210a(7) =462a(8) =506a(9) =870a(10) =930a(11) =1122a(12) =1190a(13) =1406a(14) =1482a(15) =1722a(16) =1806a(17) =2162a(18) =3306a(19) =3422a(20) =3782a(21) =4290a(22) =4422a(23) =4830a(24) =4970a(25) =5402a(26) =6006a(27) =6162a(28) =6806a(29) =7310