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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 43 |
| 4 | 856 |
| 5 | 10744 |
| 6 | 608375 |
| 7 | 14284223 |
| 8 | 551011548 |
| 9 | 19119025101 |
| 10 | 874788949035 |
| 11 | 37896009869060 |
| 12 | 20683158266928833 |
| 13 | 1799893777863733707 |
| 14 | 93147805938921355288 |
| 15 | 3757831283217050847983 |
| 16 | 180287028377782585130749 |
[1,1,6,43,856,10744,608375,14284223,551011548, 19119025101,874788949035,37896009869060, 20683158266928833,1799893777863733707, 93147805938921355288,3757831283217050847983, 180287028377782585130749] |