a(n) = A018893(n) - A291973(n).A327002a(n) = A018893(n) - A291973(n).Terms a(0) =0a(1) =0a(2) =0a(3) =10a(4) =2574a(5) =748616a(6) =282846568a(7) =141482705378External referencesoeis: A327002