Number of alternating compositions, i.e., compositions with alternating increases and decreases, starting with either an increase or a decrease.

A025047

Number of alternating compositions, i.e., compositions with alternating increases and decreases, starting with either an increase or a decrease.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =7a(6) =12a(7) =19a(8) =29a(9) =48a(10) =75a(11) =118a(12) =186a(13) =293a(14) =460a(15) =725a(16) =1139a(17) =1789a(18) =2814a(19) =4422a(20) =6949a(21) =10924a(22) =17168a(23) =26979a(24) =42404a(25) =66644a(26) =104737a(27) =164610a(28) =258707a(29) =406588

External references