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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 52 |
| 4 | 821 |
| 5 | 17536 |
| 6 | 473497 |
| 7 | 15476224 |
| 8 | 594230345 |
| 9 | 26221431808 |
| 10 | 1307680266221 |
| 11 | 72739285725184 |
| 12 | 4465197522732157 |
| 13 | 299855584017743872 |
| 14 | 21867349264346912705 |
| 15 | 1721013285639521959936 |
| 16 | 145394112130209844644113 |
| 17 | 13123788855563296766427136 |
[1,1,5,52,821,17536,473497,15476224,594230345, 26221431808,1307680266221,72739285725184, 4465197522732157,299855584017743872, 21867349264346912705,1721013285639521959936, 145394112130209844644113, 13123788855563296766427136] |