Exponential generating function: (1+3*x)/(1-2*x)^(7/2).

A000457

Exponential generating function: (1+3*x)/(1-2*x)^(7/2).

Terms

    a(0) =1a(1) =10a(2) =105a(3) =1260a(4) =17325a(5) =270270a(6) =4729725a(7) =91891800a(8) =1964187225a(9) =45831035250

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