Triangle related to number of compositions of n into relatively prime summands.

Terms

a(0) =1a(1) =1a(2) =-2a(3) =1a(4) =-3a(5) =4a(6) =1a(7) =-4a(8) =6a(9) =-8a(10) =1a(11) =-5a(12) =10a(13) =-9a(14) =16a(15) =1a(16) =-6a(17) =15a(18) =-20a(19) =9a(20) =-32a(21) =1a(22) =-7a(23) =21a(24) =-35a(25) =36a(26) =0a(27) =64a(28) =1a(29) =-8