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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 5 |
| 3 | 6 |
| 4 | 8 |
| 5 | 16 |
| 6 | 27 |
| 7 | 49 |
| 8 | 92 |
| 9 | 168 |
| 10 | 320 |
| 11 | 613 |
| 12 | 1177 |
| 13 | 2262 |
| 14 | 4432 |
| 15 | 8696 |
| 16 | 17072 |
| 17 | 33531 |
| 18 | 65885 |
| 19 | 130593 |
| 20 | 258924 |
[0,4,5,6,8,16,27,49,92,168,320,613,1177,2262,4432, 8696,17072,33531,65885,130593,258924] |