Number of Carlitz compositions of n with exactly seven descents.

Terms

a(0) =21a(1) =150a(2) =688a(3) =2561a(4) =8253a(5) =23930a(6) =64030a(7) =160539a(8) =381379a(9) =865676a(10) =1889308a(11) =3984311a(12) =8151834a(13) =16234161a(14) =31554397a(15) =59999259a(16) =111824744a(17) =204629354a(18) =368190175a(19) =652238928a(20) =1138836325a(21) =1961870558a(22) =3337496363a(23) =5611246209a(24) =9330350788a(25) =15353900381a(26) =25019429935