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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 137 |
| 4 | 13278 |
| 5 | 4098627 |
| 6 | 8002879629 |
| 7 | 66818063663192 |
| 8 | 1520456935214867934 |
| 9 | 167021181249536494996841 |
| 10 | 102867734705055054467692090431 |
| 11 | 179314863425920182637610314008444247 |
| 12 | 1094998941099523423274757578750950802034789 |
[1,2,6,137,13278,4098627,8002879629, 66818063663192,1520456935214867934, 167021181249536494996841, 102867734705055054467692090431, 179314863425920182637610314008444247, 1094998941099523423274757578750950802034789] |