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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 15 |
| 6 | 9 |
| 7 | 315 |
| 8 | 315 |
| 9 | 567 |
| 10 | 14175 |
| 11 | 6237 |
| 12 | 467775 |
| 13 | 6081075 |
| 14 | 773955 |
| 15 | 638512875 |
| 16 | 9823275 |
| 17 | 10854718875 |
| 18 | 7514805375 |
| 19 | 21837140325 |
| 20 | 9280784638125 |
| 21 | 38979295480125 |
| 22 | 2143861251406875 |
| 23 | 3792985290950625 |
| 24 | 1183411410776595 |
| 25 | 336196423516078125 |
| 26 | 9615217712559834375 |
[1,1,1,3,3,15,9,315,315,567,14175,6237,467775, 6081075,773955,638512875,9823275,10854718875, 7514805375,21837140325,9280784638125, 38979295480125,2143861251406875,3792985290950625, 1183411410776595,336196423516078125, 9615217712559834375] |