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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 15 |
| 5 | 19 |
| 6 | 129 |
| 7 | 1051 |
| 8 | 6435 |
| 9 | 7486 |
| 10 | 28893 |
| 11 | 36379 |
| 12 | 101651 |
| 13 | 138030 |
| 14 | 5622851 |
| 15 | 5760881 |
| 16 | 17144613 |
| 17 | 22905494 |
| 18 | 85861095 |
| 19 | 108766589 |
| 20 | 738460629 |
| 21 | 6016451621 |
| 22 | 36837170355 |
| 23 | 42853621976 |
| 24 | 165398036283 |
| 25 | 208251658259 |
| 26 | 581901352801 |
| 27 | 790153011060 |
| 28 | 32188021795201 |
| 29 | 32978174806261 |
[1,1,3,4,15,19,129,1051,6435,7486,28893,36379, 101651,138030,5622851,5760881,17144613,22905494, 85861095,108766589,738460629,6016451621, 36837170355,42853621976,165398036283,208251658259, 581901352801,790153011060,32188021795201, 32978174806261] |