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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | -1 |
| 6 | -15 |
| 7 | -140 |
| 8 | -1050 |
| 9 | -6951 |
| 10 | -42273 |
| 11 | -232870 |
| 12 | -949740 |
| 13 | 2401399 |
| 14 | 149618469 |
| 15 | 2979464124 |
| 16 | 47639256210 |
| 17 | 683529622229 |
| 18 | 9045426379611 |
| 19 | 109599657976942 |
| 20 | 1148191101672384 |
| 21 | 8033814119097459 |
| 22 | -50834295574038207 |
| 23 | -3977581842278623216 |
| 24 | -119536187842156328034 |
[1,0,0,0,0,-1,-15,-140,-1050,-6951,-42273,-232870, -949740,2401399,149618469,2979464124,47639256210, 683529622229,9045426379611,109599657976942, 1148191101672384,8033814119097459, -50834295574038207,-3977581842278623216, -119536187842156328034] |