Number of compositions a(1),...,a(k) of n, for some k, such that a(i+1) <= a(i) + 1 for 1 <= i < k and a(1) <= a(k) + 1.

A168445

Number of compositions a(1),...,a(k) of n, for some k, such that a(i+1) <= a(i) + 1 for 1 <= i < k and a(1) <= a(k) + 1.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =11a(5) =18a(6) =31a(7) =52a(8) =91a(9) =155a(10) =268a(11) =464a(12) =802a(13) =1390a(14) =2411a(15) =4178a(16) =7249a(17) =12578a(18) =21823a(19) =37870a(20) =65724a(21) =114061a(22) =197960a(23) =343578a(24) =596317a(25) =1034983a(26) =1796359a(27) =3117837a(28) =5411478a(29) =9392460

External references