a(n) = Sum_{d|n} phi(d)^(n+d).A342608a(n) = Sum_{d|n} phi(d)^(n+d).Terms a(0) =1a(1) =2a(2) =65a(3) =258a(4) =1048577a(5) =4610a(6) =78364164097a(7) =4294971394External referencesoeis: A342608