a(n) = 2^n*n^(n-1).A038057a(n) = 2^n*n^(n-1).Terms a(0) =2a(1) =8a(2) =72a(3) =1024a(4) =20000a(5) =497664a(6) =15059072a(7) =536870912a(8) =22039921152External referencesoeis: A038057