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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 8 |
| 3 | 16 |
| 4 | 32 |
| 5 | 54 |
| 6 | 100 |
| 7 | 182 |
| 8 | 328 |
| 9 | 494 |
| 10 | 984 |
| 11 | 1572 |
| 12 | 2656 |
| 13 | 4212 |
| 14 | 8162 |
| 15 | 11176 |
| 16 | 21704 |
| 17 | 30994 |
| 18 | 60548 |
[1,4,8,16,32,54,100,182,328,494,984,1572,2656, 4212,8162,11176,21704,30994,60548] |