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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 44 |
| 4 | 554 |
| 5 | 9084 |
| 6 | 183702 |
| 7 | 4421038 |
| 8 | 123461928 |
| 9 | 3925948968 |
| 10 | 140087469050 |
| 11 | 5543906536794 |
| 12 | 241013315412036 |
| 13 | 11418689731291036 |
| 14 | 585622428410061798 |
| 15 | 32325218349324188670 |
| 16 | 1910820256385689252208 |
| 17 | 120436526080379248980816 |
| 18 | 8062820108466517571361138 |
[1,5,44,554,9084,183702,4421038,123461928, 3925948968,140087469050,5543906536794, 241013315412036,11418689731291036, 585622428410061798,32325218349324188670, 1910820256385689252208,120436526080379248980816, 8062820108466517571361138] |