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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 46 |
| 4 | 446 |
| 5 | 4751 |
| 6 | 54132 |
| 7 | 642342 |
| 8 | 7861662 |
| 9 | 98480332 |
| 10 | 1256569506 |
| 11 | 16273981758 |
| 12 | 213378976004 |
| 13 | 2826867619109 |
| 14 | 37782553160820 |
| 15 | 508840821830546 |
| 16 | 6898459216311582 |
| 17 | 94070535317459018 |
| 18 | 1289430373206452136 |
| 19 | 17755914760643605782 |
| 20 | 245518560760433583946 |
[1,1,6,46,446,4751,54132,642342,7861662,98480332, 1256569506,16273981758,213378976004,2826867619109, 37782553160820,508840821830546,6898459216311582, 94070535317459018,1289430373206452136, 17755914760643605782,245518560760433583946] |