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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 2 |
| 4 | 8 |
| 5 | 6 |
| 6 | 23 |
| 7 | 17 |
| 8 | 68 |
| 9 | 51 |
| 10 | 205 |
| 11 | 154 |
| 12 | 627 |
| 13 | 473 |
| 14 | 1937 |
| 15 | 1464 |
| 16 | 6032 |
| 17 | 4568 |
| 18 | 18900 |
| 19 | 14332 |
| 20 | 59519 |
| 21 | 45187 |
| 22 | 188211 |
| 23 | 143024 |
| 24 | 597241 |
| 25 | 454217 |
| 26 | 1900821 |
| 27 | 1446604 |
| 28 | 6065180 |
| 29 | 4618576 |
| 30 | 19396027 |
[1,1,3,2,8,6,23,17,68,51,205,154,627,473,1937, 1464,6032,4568,18900,14332,59519,45187,188211, 143024,597241,454217,1900821,1446604,6065180, 4618576,19396027] |