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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 9 |
| 6 | 15 |
| 7 | 104 |
| 8 | 96 |
| 9 | 285 |
| 10 | 565 |
| 11 | 6214 |
| 12 | 37282 |
| 13 | 484665 |
| 14 | 6785309 |
| 15 | 101779634 |
| 16 | 814237070 |
| 17 | 13842030189 |
| 18 | 83052181131 |
| 19 | 1577991441488 |
| 20 | 7889957207436 |
| 21 | 55229700452049 |
| 22 | 1215053409945077 |
| 23 | 27946228428736770 |
| 24 | 111784913714947074 |
| 25 | 2794622842873676849 |
| 26 | 72660193914715598073 |
[1,1,2,2,9,15,104,96,285,565,6214,37282,484665, 6785309,101779634,814237070,13842030189, 83052181131,1577991441488,7889957207436, 55229700452049,1215053409945077,27946228428736770, 111784913714947074,2794622842873676849, 72660193914715598073] |