Number of integer compositions of n with weighted alternating sum 0.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =0a(6) =2a(7) =5a(8) =7a(9) =8a(10) =14a(11) =38a(12) =64a(13) =87a(14) =174a(15) =373a(16) =649a(17) =1069a(18) =2051a(19) =4091a(20) =7453a(21) =13276a(22) =25260a(23) =48990a(24) =91378a(25) =168890a(26) =321661a(27) =618323a(28) =1169126a(29) =2203649