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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 69 |
| 4 | 1204 |
| 5 | 28345 |
| 6 | 842406 |
| 7 | 30282385 |
| 8 | 1278159240 |
| 9 | 61979238513 |
| 10 | 3395850105610 |
| 11 | 207490382754721 |
| 12 | 13989267347891628 |
| 13 | 1031687145559176457 |
| 14 | 82618837044274734126 |
| 15 | 7139807492658000170865 |
| 16 | 662286433378726179463696 |
| 17 | 65635135687587192429274849 |
[1,1,6,69,1204,28345,842406,30282385,1278159240, 61979238513,3395850105610,207490382754721, 13989267347891628,1031687145559176457, 82618837044274734126,7139807492658000170865, 662286433378726179463696, 65635135687587192429274849] |