A050108 a(n)=[ a(n-1)/4 ] if this is not among 0,a(1),...,a(n-2), else a(n)=5*a(n-1).

1, 5, 25, 6, 30, 7, 35, 8, 2, 10, 50, 12, 3, 15, 75, 18, 4, 20, 100, 500, 125, 31, 155, 38, 9, 45, 11, 55, 13, 65, 16, 80, 400, 2000, 10000, 2500, 625, 156, 39, 195, 48, 240, 60, 300, 1500, 375, 93, 23, 115, 28, 140, 700, 175, 43, 215