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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 21 |
| 4 | 236 |
| 5 | 4040 |
| 6 | 114105 |
| 7 | 4662721 |
| 8 | 256485936 |
| 9 | 18226110456 |
| 10 | 1623855703785 |
| 11 | 177195820502965 |
| 12 | 23237493232958796 |
| 13 | 3605437233380103056 |
| 14 | 653193551573628910481 |
| 15 | 136634950180317224879985 |
| 16 | 32681589590709963123110080 |
| 17 | 8863149183726257535369656976 |
[0,1,21,236,4040,114105,4662721,256485936, 18226110456,1623855703785,177195820502965, 23237493232958796,3605437233380103056, 653193551573628910481,136634950180317224879985, 32681589590709963123110080, 8863149183726257535369656976] |