a(n) = (4*n+1)^(n-1).A052774a(n) = (4*n+1)^(n-1).Terms a(0) =1a(1) =1a(2) =9a(3) =169a(4) =4913a(5) =194481a(6) =9765625a(7) =594823321a(8) =42618442977External referencesoeis: A052774