A050092 a(n)=[ a(n-1)/3 ] if this is not among 0,a(1),...,a(n-2), else a(n)=7*a(n-1).

1, 7, 2, 14, 4, 28, 9, 3, 21, 147, 49, 16, 5, 35, 11, 77, 25, 8, 56, 18, 6, 42, 294, 98, 32, 10, 70, 23, 161, 53, 17, 119, 39, 13, 91, 30, 210, 1470, 490, 163, 54, 378, 126, 882, 6174, 2058, 686, 228, 76, 532, 177, 59, 19, 133, 44, 308