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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 37 |
| 5 | 134 |
| 6 | 536 |
| 7 | 2162 |
| 8 | 9124 |
| 9 | 38480 |
| 10 | 165534 |
| 11 | 723098 |
| 12 | 3193196 |
| 13 | 14221802 |
| 14 | 63772316 |
| 15 | 287880505 |
| 16 | 1309694973 |
| 17 | 5985175167 |
| 18 | 27484724851 |
| 19 | 126726210253 |
| 20 | 586613118924 |
| 21 | 2726313381339 |
| 22 | 12707197416398 |
| 23 | 59403354402305 |
| 24 | 278452680056717 |
| 25 | 1308485546821356 |
| 26 | 6164054441335823 |
| 27 | 29095697455150241 |
[1,1,3,10,37,134,536,2162,9124,38480,165534, 723098,3193196,14221802,63772316,287880505, 1309694973,5985175167,27484724851,126726210253, 586613118924,2726313381339,12707197416398, 59403354402305,278452680056717,1308485546821356, 6164054441335823,29095697455150241] |