What is the formula for this pattern? [closed]

When I enter X in a program it produces 5 bytes which I have named Y0-Y4

X       =   Y4,Y3, Y2,  Y1,Y0
------------------------------
1       =   0, 0, 128,  63, 0
------------------------------
2       =   0, 0,   0,  64, 0
3       =   0, 0,   64, 64, 0
------------------------------
4       =   0, 0,  128, 64, 0
5       =   0, 0,  160, 64, 0
6       =   0, 0,  192, 64, 0
7       =   0, 0,  224, 64, 0
------------------------------
8       =   0, 0,    0, 65, 0
9       =   0, 0,   16, 65, 0
10      =   0, 0,   32, 65, 0
...
14      =   0, 0,   96, 65, 0
15      =   0, 0,  112, 65, 0
------------------------------
16      =   0, 0,  128, 65, 0
17      =   0, 0,  136, 65, 0
18      =   0, 0,  144, 65, 0
...
30      =   0, 0,  240, 65, 0
31      =   0, 0,  248, 65, 0
------------------------------
32      =   0, 0,    0, 66, 0
33      =   0, 0,    4, 66, 0
...
63      =   0, 0,  124, 66, 0
------------------------------
64      =   0, 0,  128, 66, 0
65      =   0, 0,  130, 66, 0
66      =   0, 0,  132, 66, 0
67      =   0, 0,  134, 66, 0
...
127     =   0, 0,  254, 66, 0
------------------------------
128     =   0, 0,    0, 67, 0
129     =   0, 0,    1, 67, 0
130     =   0, 0,    2, 67, 0
...
255     =   0, 0,  127, 67, 0
------------------------------
256     =   0, 0,  128, 67, 0
257     =   0, 128,128, 67, 0

Is there a particular formula for this pattern? Values in the byte array do not pass 256. I am looking for a way to validate the values and get X.