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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 21 |
| 5 | 100 |
| 6 | 204 |
| 7 | 401 |
| 8 | 3062 |
| 9 | 5974 |
| 10 | 11402 |
| 11 | 22597 |
| 12 | 22598 |
| 13 | 43553 |
| 14 | 85519 |
| 15 | 166243 |
| 16 | 1218380 |
| 17 | 8854646 |
| 18 | 248592083 |
| 19 | 248592084 |
| 20 | 485966511 |
[1,2,8,21,100,204,401,3062,5974,11402,22597,22598, 43553,85519,166243,1218380,8854646,248592083, 248592084,485966511] |