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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 238 |
| 4 | 15200 |
| 5 | 3013980 |
| 6 | 1828979530 |
| 7 | 3373190565626 |
| 8 | 18837339867421686 |
| 9 | 317817051628161116674 |
| 10 | 16176220447967300610844988 |
| 11 | 2481251352301850541661479580329 |
| 12 | 1146112129196402690505198891390847384 |
[1,2,12,238,15200,3013980,1828979530, 3373190565626,18837339867421686, 317817051628161116674,16176220447967300610844988, 2481251352301850541661479580329, 1146112129196402690505198891390847384] |