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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 12 |
| 4 | 53 |
| 5 | 152 |
| 6 | 361 |
| 7 | -168 |
| 8 | -16055 |
| 9 | -123200 |
| 10 | -779827 |
| 11 | -2504832 |
| 12 | 18694397 |
| 13 | 338660480 |
| 14 | 3543246193 |
| 15 | 19320001536 |
| 16 | -64409565935 |
| 17 | -2591458500608 |
| 18 | -36445173712747 |
| 19 | -254934852857856 |
| 20 | 809555224961861 |
| 21 | 46263863308992512 |
| 22 | 744209131179612025 |
| 23 | 5617003290092961792 |
[1,1,5,12,53,152,361,-168,-16055,-123200,-779827, -2504832,18694397,338660480,3543246193, 19320001536,-64409565935,-2591458500608, -36445173712747,-254934852857856,809555224961861, 46263863308992512,744209131179612025, 5617003290092961792] |