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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 3 |
| 3 | -40 |
| 4 | -190 |
| 5 | -168 |
| 6 | 2023 |
| 7 | 10096 |
| 8 | 9486 |
| 9 | -110440 |
| 10 | -564322 |
| 11 | -547248 |
| 12 | 6266884 |
| 13 | 32468464 |
| 14 | 32101935 |
| 15 | -364054048 |
| 16 | -1903389802 |
| 17 | -1906695144 |
| 18 | 21484821178 |
| 19 | 113055206800 |
| 20 | 114325154076 |
| 21 | -1282403513776 |
[1,4,3,-40,-190,-168,2023,10096,9486,-110440, -564322,-547248,6266884,32468464,32101935, -364054048,-1903389802,-1906695144,21484821178, 113055206800,114325154076,-1282403513776] |