a(n) = 2^n*C(n-1) - A186997(n-1), where C(n) are the Catalan numbers (A000108).

A192479

a(n) = 2^n*C(n-1) - A186997(n-1), where C(n) are the Catalan numbers (A000108).

Terms

    a(0) =1a(1) =3a(2) =12a(3) =61a(4) =344a(5) =2074a(6) =13080a(7) =85229a(8) =569264a(9) =3876766a(10) =26817304a(11) =187908802a(12) =1330934032a(13) =9513485076a(14) =68539442800a(15) =497178707325

External references