| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 2 |
| 7 | 9 |
| 8 | 13 |
| 9 | 28 |
| 10 | 22 |
| 11 | 174 |
| 12 | 143 |
| 13 | 1421 |
| 14 | 1179 |
| 15 | 965 |
| 16 | 1627 |
| 17 | 22543 |
| 18 | 19720 |
| 19 | 311514 |
| 20 | 273894 |
| 21 | 236320 |
| 22 | 209255 |
| 23 | 4127583 |
| 24 | 3734824 |
| 25 | 16283658 |
| 26 | 14694118 |
| 27 | 39214357 |
| 28 | 35681217 |
| 29 | 915568753 |
| 30 | 847646751 |
| 31 | 23431024516 |
| 32 | 43093548356 |
| 33 | 39165894190 |
[1,1,1,1,3,2,9,13,28,22,174,143,1421,1179,965, 1627,22543,19720,311514,273894,236320,209255, 4127583,3734824,16283658,14694118,39214357, 35681217,915568753,847646751,23431024516, 43093548356,39165894190] |