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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 12 |
| 4 | 294 |
| 5 | 10556 |
| 6 | 488105 |
| 7 | 27237748 |
| 8 | 1766404068 |
| 9 | 129955274460 |
| 10 | 10668008963012 |
| 11 | 965419570076880 |
| 12 | 95430263520948342 |
| 13 | 10228351567332536636 |
| 14 | 1181548204752647642190 |
| 15 | 146354418172125510269224 |
| 16 | 19353257235976807395819160 |
| 17 | 2721549078621826864159594548 |
[1,1,12,294,10556,488105,27237748,1766404068, 129955274460,10668008963012,965419570076880, 95430263520948342,10228351567332536636, 1181548204752647642190,146354418172125510269224, 19353257235976807395819160, 2721549078621826864159594548] |