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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | -50 |
| 5 | -838 |
| 6 | 1730 |
| 7 | 136530 |
| 8 | -486826 |
| 9 | -53845210 |
| 10 | 608573414 |
| 11 | 39761626434 |
| 12 | -1250658124134 |
| 13 | -39125693738246 |
| 14 | 3470290682698798 |
| 15 | 1980500546819286 |
| 16 | -11592469556319388642 |
| 17 | 475984934077375262394 |
| 18 | 35772633977318034763762 |
[1,2,6,14,-50,-838,1730,136530,-486826,-53845210, 608573414,39761626434,-1250658124134, -39125693738246,3470290682698798,1980500546819286, -11592469556319388642,475984934077375262394, 35772633977318034763762] |