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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 126 |
| 8 | 3486 |
| 9 | 63756 |
| 10 | 954387 |
| 11 | 9628542 |
| 12 | 97141022 |
| 13 | 886634892 |
| 14 | 7048863822 |
| 15 | 53483658228 |
| 16 | 397751490318 |
| 17 | 2858731936788 |
| 18 | 19510233553063 |
| 19 | 130084038669798 |
| 20 | 844004265958794 |
| 21 | 5657554841332464 |
| 22 | 35647504639822614 |
| 23 | 227439073802247384 |
| 24 | 1425548351910315534 |
| 25 | 8934412155886521480 |
[1,126,3486,63756,954387,9628542,97141022, 886634892,7048863822,53483658228,397751490318, 2858731936788,19510233553063,130084038669798, 844004265958794,5657554841332464, 35647504639822614,227439073802247384, 1425548351910315534,8934412155886521480] |