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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 54 |
| 3 | 924 |
| 4 | 19696 |
| 5 | 456052 |
| 6 | 11169884 |
| 7 | 284749896 |
| 8 | 7478180356 |
| 9 | 200946163564 |
| 10 | 5498658652872 |
| 11 | 152701830225328 |
| 12 | 4292791741022352 |
| 13 | 121927662325745128 |
| 14 | 3493616278749683152 |
| 15 | 100864166949775322480 |
| 16 | 2931337070411050352250 |
[6,54,924,19696,456052,11169884,284749896, 7478180356,200946163564,5498658652872, 152701830225328,4292791741022352, 121927662325745128,3493616278749683152, 100864166949775322480,2931337070411050352250] |