Number of integer compositions y of n with a fixed point y(i) = i.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =5a(5) =10a(6) =21a(7) =42a(8) =86a(9) =174a(10) =351a(11) =708a(12) =1424a(13) =2861a(14) =5743a(15) =11520a(16) =23092a(17) =46269a(18) =92673a(19) =185562a(20) =371469a(21) =743491a(22) =1487870a(23) =2977164a(24) =5956616a(25) =11916910a(26) =23839736a(27) =47688994a(28) =95393322a(29) =190811346