Number of even-length compositions of n with alternating parts distinct.

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =3a(5) =4a(6) =9a(7) =14a(8) =28a(9) =44a(10) =83a(11) =136a(12) =250a(13) =424a(14) =757a(15) =1310a(16) =2313a(17) =4018a(18) =7081a(19) =12314a(20) =21650a(21) =37786a(22) =66264a(23) =115802a(24) =202950a(25) =354858a(26) =621525a(27) =1087252a(28) =1903668a(29) =3330882