Number of compositions of n with distinct circular differences up to sign.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =7a(8) =21a(9) =31a(10) =41a(11) =87a(12) =99a(13) =191a(14) =245a(15) =381a(16) =501a(17) =735a(18) =883a(19) =1309a(20) =1841a(21) =2589a(22) =3435a(23) =4941a(24) =6857a(25) =9791a(26) =13503a(27) =19475a(28) =27073a(29) =37175