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| n | a(n) |
|---|---|
| 1 | 234 |
| 2 | 406 |
| 3 | 1692 |
| 4 | 5401 |
| 5 | 14437 |
| 6 | 49303 |
| 7 | 171877 |
| 8 | 608194 |
| 9 | 1974583 |
| 10 | 6828851 |
| 11 | 23697904 |
| 12 | 82511604 |
| 13 | 280821141 |
| 14 | 969113166 |
| 15 | 3356595204 |
| 16 | 11627225657 |
| 17 | 40028089405 |
| 18 | 138218574688 |
| 19 | 478039503452 |
| 20 | 1653233404522 |
| 21 | 5707628406749 |
| 22 | 19717537044734 |
[234,406,1692,5401,14437,49303,171877,608194, 1974583,6828851,23697904,82511604,280821141, 969113166,3356595204,11627225657,40028089405, 138218574688,478039503452,1653233404522, 5707628406749,19717537044734] |