Code:
rom const int drive_lookup[]= {0, 0, 0, 0, 0, 5, 10, 13, 15, 16,
18, 20, 21, 23, 24, 26, 28, 29, 31, 32, 34, 35, 36, 38, 39, 41,
42, 43, 45, 46, 47, 49, 50, 51, 53, 54, 55, 56, 58, 59, 60, 61,
62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78,
79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 88, 89, 90, 91, 92, 93,
94, 94, 95, 96, 97, 98, 98, 99, 100, 101, 101, 102, 103, 103, 104,
105, 106, 106, 107, 108, 108, 109, 110, 110, 111, 111, 112, 113,
113, 114, 114, 115, 116, 116, 117, 117, 118, 118, 119, 120, 120,
121, 121, 122, 122, 123, 123, 124, 124, 125, 125, 126, 126, 127,
127, 127, 128, 128, 129, 129, 130, 130, 131, 131, 132, 132, 133,
133, 134, 135, 135, 136, 136, 137, 137, 138, 139, 139, 140, 140,
141, 142, 142, 143, 143, 144, 145, 145, 146, 147, 147, 148, 149,
150, 150, 151, 152, 152, 153, 154, 155, 155, 156, 157, 158, 159,
159, 160, 161, 162, 163, 164, 165, 165, 166, 167, 168, 169, 170,
171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183,
184, 185, 186, 187, 188, 190, 191, 192, 193, 194, 195, 197, 198,
199, 200, 202, 203, 204, 206, 207, 208, 210, 211, 212, 214, 215,
217, 218, 219, 221, 222, 224, 225, 227, 229, 230, 232, 233, 235,
237, 238, 240, 245, 250, 254, 254, 254, 254, 254, 254};
At the endpoints, I chose to replace several of the last terms with an endvalue. Notice how there are several 254 terms at the end and several zeros in the beginning.