Smallest size of which there are n tatami-free rooms.

Terms

a(0) =70a(1) =198a(2) =336a(3) =504a(4) =1320a(5) =1440a(6) =3696a(7) =3360a(8) =5040a(9) =8400a(10) =6720a(11) =10080a(12) =16632a(13) =16800a(14) =18480a(15) =20160a(16) =15120a(17) =33264a(18) =37800a(19) =30240a(20) =45360a(21) =73920a(22) =60480a(23) =65520a(24) =85680a(25) =55440a(26) =124740a(27) =142560a(28) =138600a(29) =151200