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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 130 |
| 5 | 1485 |
| 6 | 22506 |
| 7 | 435027 |
| 8 | 10410920 |
| 9 | 301428809 |
| 10 | 10364922506 |
| 11 | 416904311679 |
| 12 | 19367862679116 |
| 13 | 1028066746575921 |
| 14 | 61777572340631590 |
| 15 | 4168811889484558531 |
| 16 | 313687075056806770384 |
| 17 | 26155857588261661013601 |
| 18 | 2403313718268521605455858 |
| 19 | 242132010466304405558972343 |
[1,1,3,16,130,1485,22506,435027,10410920, 301428809,10364922506,416904311679,19367862679116, 1028066746575921,61777572340631590, 4168811889484558531,313687075056806770384, 26155857588261661013601,2403313718268521605455858, 242132010466304405558972343] |