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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 46 |
| 5 | 149 |
| 6 | 1834 |
| 7 | 5651 |
| 8 | 24438 |
| 9 | 127841 |
| 10 | 152279 |
| 11 | 280120 |
| 12 | 17519719 |
| 13 | 17799839 |
| 14 | 35319558 |
| 15 | 194397629 |
| 16 | 812910074 |
| 17 | 2633127851 |
| 18 | 32410444286 |
| 19 | 99864460709 |
| 20 | 431868287122 |
| 21 | 2259205896319 |
| 22 | 2691074183441 |
| 23 | 4950280079760 |
| 24 | 309608439128561 |
| 25 | 314558719208321 |
[1,1,2,11,46,149,1834,5651,24438,127841,152279, 280120,17519719,17799839,35319558,194397629, 812910074,2633127851,32410444286,99864460709, 431868287122,2259205896319,2691074183441, 4950280079760,309608439128561,314558719208321] |