Difference between Catalan numbers and Fibonacci numbers: a(n) = C(n) - F(n).

Terms

a(0) =1a(1) =0a(2) =1a(3) =3a(4) =11a(5) =37a(6) =124a(7) =416a(8) =1409a(9) =4828a(10) =16741a(11) =58697a(12) =207868a(13) =742667a(14) =2674063a(15) =9694235a(16) =35356683a(17) =129643193a(18) =477636116a(19) =1767259009a(20) =6564113655a(21) =24466256074a(22) =91482545929a(23) =343059584993