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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 158 |
| 4 | 4246 |
| 5 | 154924 |
| 6 | 7162292 |
| 7 | 401410680 |
| 8 | 26453842848 |
| 9 | 2004890580840 |
| 10 | 171808440737928 |
| 11 | 16427634731841552 |
| 12 | 1733913231506623632 |
| 13 | 200249346295125726624 |
| 14 | 25118871041680870112352 |
| 15 | 3400884689353492497349248 |
| 16 | 494317826168209713209318400 |
| 17 | 76773315675375252953433141120 |
[1,1,9,158,4246,154924,7162292,401410680, 26453842848,2004890580840,171808440737928, 16427634731841552,1733913231506623632, 200249346295125726624,25118871041680870112352, 3400884689353492497349248, 494317826168209713209318400, 76773315675375252953433141120] |