G.f. A(x) satisfies: A(x) = B(x)*C(x) where B(x) = 1 + x*A(x)*C(x) and C(x) = 1 + 2*x*A(x)*B(x).

A258313

G.f. A(x) satisfies: A(x) = B(x)*C(x) where B(x) = 1 + x*A(x)*C(x) and C(x) = 1 + 2*x*A(x)*B(x).

Terms

    a(0) =1a(1) =3a(2) =15a(3) =93a(4) =641a(5) =4719a(6) =36335a(7) =289017a(8) =2356321a(9) =19586283a(10) =165364799a(11) =1414193205a(12) =12224831937a(13) =106645825047a(14) =937685498271

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