Number of compositions of n having exactly one fixed point.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =7a(5) =16a(6) =29a(7) =60a(8) =120a(9) =238a(10) =479a(11) =956a(12) =1910a(13) =3817a(14) =7633a(15) =15252a(16) =30491a(17) =60955a(18) =121865a(19) =243650a(20) =487165a(21) =974112a(22) =1947851a(23) =3895086a(24) =7789153a(25) =15576624a(26) =31150481a(27) =62296424a(28) =124585395a(29) =249158607