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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 161 |
| 5 | 1791 |
| 6 | 24847 |
| 7 | 413449 |
| 8 | 8036625 |
| 9 | 178852753 |
| 10 | 4486426091 |
| 11 | 125279093259 |
| 12 | 3854964555697 |
| 13 | 129618443364463 |
| 14 | 4728625129171959 |
| 15 | 186034319795094481 |
| 16 | 7851808690935373793 |
| 17 | 353903271319498588641 |
| 18 | 16966669198377512202643 |
[1,1,3,19,161,1791,24847,413449,8036625,178852753, 4486426091,125279093259,3854964555697, 129618443364463,4728625129171959, 186034319795094481,7851808690935373793, 353903271319498588641,16966669198377512202643] |