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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 49 |
| 3 | 392 |
| 4 | 3136 |
| 5 | 25088 |
| 6 | 200704 |
| 7 | 1605632 |
| 8 | 12845056 |
| 9 | 102760448 |
| 10 | 822083584 |
| 11 | 6576668672 |
| 12 | 52613349376 |
| 13 | 420906795008 |
| 14 | 3367254360064 |
| 15 | 26938034880512 |
| 16 | 215504279044096 |
| 17 | 1724034232352768 |
| 18 | 13792273858822144 |
| 19 | 110338190870577152 |
[1,6,49,392,3136,25088,200704,1605632,12845056, 102760448,822083584,6576668672,52613349376, 420906795008,3367254360064,26938034880512, 215504279044096,1724034232352768, 13792273858822144,110338190870577152] |