E.g.f. (1+x^2-2x^3)/(1-2x).

A052576

E.g.f. (1+x^2-2x^3)/(1-2x).

Terms

    a(0) =1a(1) =2a(2) =10a(3) =48a(4) =384a(5) =3840a(6) =46080a(7) =645120a(8) =10321920a(9) =185794560a(10) =3715891200a(11) =81749606400

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