| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 3 |
| 8 | 7 |
| 9 | 11 |
| 10 | 26 |
| 11 | 44 |
| 12 | 118 |
| 13 | 221 |
| 14 | 677 |
| 15 | 1721 |
| 16 | 6884 |
| 17 | 21165 |
| 18 | 95800 |
| 19 | 324693 |
| 20 | 1633462 |
| 21 | 6253408 |
| 22 | 35917622 |
| 23 | 161554715 |
| 24 | 1151376732 |
| 25 | 6387653627 |
| 26 | 54325024024 |
| 27 | 348582834189 |
| 28 | 3376194023305 |
| 29 | 24664208882500 |
| 30 | 273518249356480 |
[1,1,1,1,1,1,2,3,7,11,26,44,118,221,677,1721,6884, 21165,95800,324693,1633462,6253408,35917622, 161554715,1151376732,6387653627,54325024024, 348582834189,3376194023305,24664208882500, 273518249356480] |