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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 23 |
| 3 | 225 |
| 4 | 2583 |
| 5 | 32133 |
| 6 | 422069 |
| 7 | 5757699 |
| 8 | 80790775 |
| 9 | 1158593589 |
| 10 | 16905540753 |
| 11 | 250185539079 |
| 12 | 3746205581589 |
| 13 | 56652844671855 |
| 14 | 864032059578879 |
| 15 | 13274539401672345 |
| 16 | 205252378269637815 |
| 17 | 3191578469685269925 |
| 18 | 49876569284504593505 |
| 19 | 782943268394316187815 |
[1,3,23,225,2583,32133,422069,5757699,80790775, 1158593589,16905540753,250185539079,3746205581589, 56652844671855,864032059578879,13274539401672345, 205252378269637815,3191578469685269925, 49876569284504593505,782943268394316187815] |