a(n) = (5*n - 1)^(n-1).A274269a(n) = (5*n - 1)^(n-1).Terms a(0) =1a(1) =9a(2) =196a(3) =6859a(4) =331776a(5) =20511149a(6) =1544804416a(7) =137231006679External referencesoeis: A274269