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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 12 |
| 3 | 382 |
| 4 | 23352 |
| 5 | 2223002 |
| 6 | 318236292 |
| 7 | 63069898582 |
| 8 | 16506522005232 |
| 9 | 5516152886719922 |
| 10 | 2290713333669640572 |
| 11 | 1156963264109505327022 |
| 12 | 698325697094916345135912 |
| 13 | 496389417580098665436907082 |
[0,2,12,382,23352,2223002,318236292,63069898582, 16506522005232,5516152886719922, 2290713333669640572,1156963264109505327022, 698325697094916345135912, 496389417580098665436907082] |