Number of compositions (ordered partitions) of n into parts having a common factor > 1 with n.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =1a(6) =5a(7) =1a(8) =8a(9) =4a(10) =17a(11) =1a(12) =60a(13) =1a(14) =65a(15) =19a(16) =128a(17) =1a(18) =800a(19) =1a(20) =683a(21) =67a(22) =1025a(23) =1a(24) =11005a(25) =16a(26) =4097a(27) =256a(28) =9203a(29) =1