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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 15 |
| 3 | 57 |
| 4 | 571 |
| 5 | 919 |
| 6 | 1531 |
| 7 | 2313 |
| 8 | 193107 |
| 9 | 923755 |
| 10 | 3870833 |
| 11 | -2470257 |
| 12 | -146827409 |
| 13 | -230596717 |
| 14 | 2290003475 |
| 15 | 13080152617 |
| 16 | 253889113987 |
| 17 | -1578843080909 |
| 18 | -15542657972939 |
| 19 | -10764297242445 |
| 20 | 612468847320021 |
| 21 | 2467732201838601 |
| 22 | 847831210033293 |
| 23 | -57573918082836705 |
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