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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 95 |
| 4 | 1954 |
| 5 | 54244 |
| 6 | 1901560 |
| 7 | 80648658 |
| 8 | 4016874920 |
| 9 | 229881369768 |
| 10 | 14866341101064 |
| 11 | 1072223706468672 |
| 12 | 85337672738960736 |
| 13 | 7429736462231570304 |
| 14 | 702426961910810154624 |
| 15 | 71667022709644235679120 |
| 16 | 7848761844632669045606016 |
| 17 | 918383128248130459272478080 |
[1,1,7,95,1954,54244,1901560,80648658,4016874920, 229881369768,14866341101064,1072223706468672, 85337672738960736,7429736462231570304, 702426961910810154624,71667022709644235679120, 7848761844632669045606016, 918383128248130459272478080] |