A050135 a(n)=[ a(n-1)/2 ] if this is not among 0,a(1),...,a(n-1), else a(n)=4*n.

1, 8, 4, 2, 20, 10, 5, 32, 16, 40, 44, 22, 11, 56, 28, 14, 7, 3, 76, 38, 19, 9, 92, 46, 23, 104, 52, 26, 13, 6, 124, 62, 31, 15, 140, 70, 35, 17, 156, 78, 39, 168, 84, 42, 21, 184, 188, 94, 47, 200, 100, 50, 25, 12, 220, 110, 55, 27, 236