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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 54 |
| 3 | 588 |
| 4 | 7110 |
| 5 | 91476 |
| 6 | 1224636 |
| 7 | 16849944 |
| 8 | 236523078 |
| 9 | 3371140740 |
| 10 | 48630906324 |
| 11 | 708412918824 |
| 12 | 10403176168476 |
| 13 | 153813188724552 |
| 14 | 2287366047735480 |
| 15 | 34185974267420208 |
| 16 | 513159651195396678 |
| 17 | 7732530110414488932 |
[1,6,54,588,7110,91476,1224636,16849944,236523078, 3371140740,48630906324,708412918824, 10403176168476,153813188724552,2287366047735480, 34185974267420208,513159651195396678, 7732530110414488932] |