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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 23 |
| 4 | 1674 |
| 5 | 652048 |
| 6 | 1134460910 |
| 7 | 7900674292378 |
| 8 | 229078019084673798 |
| 9 | 26549036304190836144544 |
| 10 | 12611418068196090318131968752 |
| 11 | 23955745839516317585042064530077352 |
| 12 | 185026624806098273753009169783707528668060 |
[1,1,2,23,1674,652048,1134460910,7900674292378, 229078019084673798,26549036304190836144544, 12611418068196090318131968752, 23955745839516317585042064530077352, 185026624806098273753009169783707528668060] |