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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 262 |
| 5 | 4336 |
| 6 | 91984 |
| 7 | 2381408 |
| 8 | 72800928 |
| 9 | 2566606784 |
| 10 | 102515201984 |
| 11 | 4575271116032 |
| 12 | 225649908491264 |
| 13 | 12187240730230528 |
| 14 | 715392567595403520 |
| 15 | 45349581052869924352 |
| 16 | 3087516727770990992896 |
| 17 | 224691760916830871873536 |
[1,3,22,262,4336,91984,2381408,72800928, 2566606784,102515201984,4575271116032, 225649908491264,12187240730230528, 715392567595403520,45349581052869924352, 3087516727770990992896,224691760916830871873536] |