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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 43 |
| 6 | 179 |
| 7 | 801 |
| 8 | 3861 |
| 9 | 19991 |
| 10 | 110679 |
| 11 | 652127 |
| 12 | 4071179 |
| 13 | 26823449 |
| 14 | 185864737 |
| 15 | 1350279523 |
| 16 | 10256563803 |
| 17 | 81258332915 |
| 18 | 669990127123 |
| 19 | 5737790656217 |
| 20 | 50947129880373 |
| 21 | 468260045596695 |
| 22 | 4448381809651895 |
| 23 | 43618802110132167 |
| 24 | 440918949811405787 |
[1,1,3,11,43,179,801,3861,19991,110679,652127, 4071179,26823449,185864737,1350279523,10256563803, 81258332915,669990127123,5737790656217, 50947129880373,468260045596695,4448381809651895, 43618802110132167,440918949811405787] |