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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 361 |
| 3 | 2172 |
| 4 | 130681 |
| 5 | 786258 |
| 6 | 47306161 |
| 7 | 284623224 |
| 8 | 17124699601 |
| 9 | 103032820830 |
| 10 | 6199093949401 |
| 11 | 37297596517236 |
| 12 | 2244054884983561 |
| 13 | 13501626906418602 |
| 14 | 812341669270099681 |
| 15 | 4887551642527016688 |
| 16 | 294065440220891100961 |
| 17 | 1769280192967873622454 |
[1,6,361,2172,130681,786258,47306161,284623224, 17124699601,103032820830,6199093949401, 37297596517236,2244054884983561,13501626906418602, 812341669270099681,4887551642527016688, 294065440220891100961,1769280192967873622454] |