Number of non-factorable subsets of size >= 2 of a 1 X n uniform grid.

Terms

a(0) =0a(1) =1a(2) =4a(3) =10a(4) =23a(5) =49a(6) =100a(7) =202a(8) =413a(9) =839a(10) =1713a(11) =3493a(12) =7130a(13) =14535a(14) =29617a(15) =60158a(16) =122077a(17) =247132a(18) =499409a(19) =1007440a(20) =2029801a(21) =4083888a(22) =8208828a(23) =16484742a(24) =33081031a(25) =66342016a(26) =132979769a(27) =266433643a(28) =533645668a(29) =1068542949