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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 11 |
| 6 | 29 |
| 7 | 66 |
| 8 | 216 |
| 9 | 656 |
| 10 | 2595 |
| 11 | 9744 |
| 12 | 49895 |
| 13 | 232379 |
| 14 | 1409681 |
| 15 | 8499639 |
| 16 | 62575472 |
| 17 | 457432705 |
| 18 | 4149365733 |
| 19 | 37128654099 |
| 20 | 403871166718 |
| 21 | 4462555420780 |
| 22 | 57791900756532 |
| 23 | 769856248243565 |
| 24 | 12070457173762581 |
| 25 | 193254691673461508 |
| 26 | 3581624759657803466 |
[1,1,2,3,6,11,29,66,216,656,2595,9744,49895, 232379,1409681,8499639,62575472,457432705, 4149365733,37128654099,403871166718,4462555420780, 57791900756532,769856248243565,12070457173762581, 193254691673461508,3581624759657803466] |