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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 224 |
| 4 | 10480 |
| 5 | 953192 |
| 6 | 142380112 |
| 7 | 31483710848 |
| 8 | 9628770928896 |
| 9 | 3883258826234432 |
| 10 | 1993590236304413824 |
| 11 | 1267882998458215791104 |
| 12 | 977550890979543106650112 |
| 13 | 897784324116559558728995584 |
[1,2,12,224,10480,953192,142380112,31483710848, 9628770928896,3883258826234432, 1993590236304413824,1267882998458215791104, 977550890979543106650112, 897784324116559558728995584] |