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A155119
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a(n)=5*a(n-1)+5*a(n-2), n>2 ; a(0)=1, a(1)=4, a(2)=24 .
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1
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1, 4, 24, 140, 820, 4800, 28100, 164500, 963000, 5637500, 33002500, 193200000, 1131012500, 6621062500, 38760375000, 226907187500, 1328337812500, 7776225000000, 45522814062500, 266495195312500, 1540090046875000
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