Number of compositions of n with exactly one descent.

Terms

a(0) =1a(1) =3a(2) =9a(3) =19a(4) =41a(5) =77a(6) =142a(7) =247a(8) =421a(9) =689a(10) =1113a(11) =1750a(12) =2712a(13) =4128a(14) =6208a(15) =9201a(16) =13502a(17) =19585a(18) =28158a(19) =40109a(20) =56689a(21) =79486a(22) =110703a(23) =153129a(24) =210536a(25) =287752a(26) =391172a(27) =528961a(28) =711837a(29) =953429