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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 18 |
| 3 | 34 |
| 4 | 64 |
| 5 | 116 |
| 6 | 214 |
| 7 | 392 |
| 8 | 732 |
| 9 | 1370 |
| 10 | 2604 |
| 11 | 4972 |
| 12 | 9598 |
| 13 | 18608 |
| 14 | 36340 |
| 15 | 71210 |
| 16 | 140196 |
| 17 | 276692 |
| 18 | 547710 |
| 19 | 1086040 |
| 20 | 2157532 |
| 21 | 4291130 |
| 22 | 8544796 |
| 23 | 17028188 |
| 24 | 33959550 |
| 25 | 67760864 |
| 26 | 135270756 |
| 27 | 270132298 |
| 28 | 539612596 |
| 29 | 1078163972 |
| 30 | 2154631102 |
| 31 | 4306504136 |
[8,18,34,64,116,214,392,732,1370,2604,4972,9598, 18608,36340,71210,140196,276692,547710,1086040, 2157532,4291130,8544796,17028188,33959550, 67760864,135270756,270132298,539612596,1078163972, 2154631102,4306504136] |