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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 46 |
| 3 | 364 |
| 4 | 2902 |
| 5 | 23188 |
| 6 | 185420 |
| 7 | 1483096 |
| 8 | 11863910 |
| 9 | 94908420 |
| 10 | 759257636 |
| 11 | 6074027496 |
| 12 | 48592102396 |
| 13 | 388736403144 |
| 14 | 3109889739352 |
| 15 | 24879112565936 |
| 16 | 199032881137798 |
| 17 | 1592262978387044 |
| 18 | 12738103567806772 |
| 19 | 101904827587176776 |
| 20 | 815238617162887828 |
| 21 | 6521908924174861784 |
[1,6,46,364,2902,23188,185420,1483096,11863910, 94908420,759257636,6074027496,48592102396, 388736403144,3109889739352,24879112565936, 199032881137798,1592262978387044, 12738103567806772,101904827587176776, 815238617162887828,6521908924174861784] |