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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -322 |
| 3 | -3992 |
| 4 | 310540 |
| 5 | 6639344 |
| 6 | -498255224 |
| 7 | -15457610528 |
| 8 | 1117041417872 |
| 9 | 46265544539200 |
| 10 | -3212977815009824 |
| 11 | -169229451802535296 |
| 12 | 11268933708996384448 |
| 13 | 731470391347068698368 |
| 14 | -46589813151941838471040 |
| 15 | -3647677144462096434561536 |
| 16 | 221619644102496735309926656 |
[1,4,-322,-3992,310540,6639344,-498255224, -15457610528,1117041417872,46265544539200, -3212977815009824,-169229451802535296, 11268933708996384448,731470391347068698368, -46589813151941838471040, -3647677144462096434561536, 221619644102496735309926656] |