Number of compositions of n where any two parts have a common divisor > 1.

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) =38a(13) =1a(14) =65a(15) =19a(16) =128a(17) =1a(18) =284a(19) =1a(20) =518a(21) =67a(22) =1025a(23) =1a(24) =2168a(25) =16a(26) =4097a(27) =256a(28) =8198a(29) =1