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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 21 |
| 4 | 588 |
| 5 | 28230 |
| 6 | 2092206 |
| 7 | 220611384 |
| 8 | 31373370936 |
| 9 | 5785037767440 |
| 10 | 1342136211324090 |
| 11 | 382559909729171328 |
| 12 | 131411551493995125828 |
| 13 | 53537846795391076075776 |
| 14 | 25523603120175022166538150 |
| 15 | 14076445847378724286239575040 |
| 16 | 8892219411843450738850246324464 |
[2,21,588,28230,2092206,220611384,31373370936, 5785037767440,1342136211324090,382559909729171328, 131411551493995125828,53537846795391076075776, 25523603120175022166538150, 14076445847378724286239575040, 8892219411843450738850246324464] |