Expansion of the exponential series exp( x * T(x) ) = exp( x / sqrt(1 - 2*x - 3*x^2) ), where T(x) is the ordinary generating series of the central trinomial coefficients (A002426).

A080896

Expansion of the exponential series exp( x * T(x) ) = exp( x / sqrt(1 - 2*x - 3*x^2) ), where T(x) is the ordinary generating series of the central trinomial coefficients (A002426).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =25a(4) =265a(5) =3741a(6) =64051a(7) =1298053a(8) =30295665a(9) =800411545a(10) =23601417571a(11) =768200763441

External references