Number of compositions of n where differences between neighboring parts are in {-2,2}.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =3a(7) =2a(8) =6a(9) =4a(10) =4a(11) =3a(12) =13a(13) =6a(14) =5a(15) =6a(16) =21a(17) =10a(18) =10a(19) =9a(20) =33a(21) =18a(22) =14a(23) =15a(24) =58a(25) =30a(26) =19a(27) =27a(28) =96a(29) =51