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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 298 |
| 3 | 3594 |
| 4 | 39763 |
| 5 | 417567 |
| 6 | 4236796 |
| 7 | 41963988 |
| 8 | 408348325 |
| 9 | 3920543913 |
| 10 | 37248255694 |
| 11 | 350941450782 |
| 12 | 3284131050487 |
| 13 | 30562445793459 |
| 14 | 283104150028192 |
| 15 | 2612274474873576 |
| 16 | 24025167335391049 |
| 17 | 220344082704460605 |
[1,21,298,3594,39763,417567,4236796,41963988, 408348325,3920543913,37248255694,350941450782, 3284131050487,30562445793459,283104150028192, 2612274474873576,24025167335391049, 220344082704460605] |