7^n mod 5^n.

Terms

a(0) =0a(1) =2a(2) =24a(3) =93a(4) =526a(5) =1182a(6) =8274a(7) =42293a(8) =296051a(9) =1291107a(10) =9037749a(11) =24201743a(12) =169412201a(13) =453463532a(14) =732838474a(15) =17336900568a(16) =121358303976a(17) =696920237207