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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 10 |
| 6 | 125 |
| 7 | 1610 |
| 8 | 23597 |
| 9 | 394506 |
| 10 | 7533445 |
| 11 | 163190665 |
| 12 | 3971678359 |
| 13 | 107502644249 |
| 14 | 3205669601953 |
| 15 | 104435680520535 |
| 16 | 3690517248021753 |
| 17 | 140590728463023632 |
| 18 | 5743180320999041664 |
| 19 | 250423270549658253350 |
| 20 | 11608409727652016747176 |
| 21 | 570034426072900362961212 |
[1,10,125,1610,23597,394506,7533445,163190665, 3971678359,107502644249,3205669601953, 104435680520535,3690517248021753, 140590728463023632,5743180320999041664, 250423270549658253350,11608409727652016747176, 570034426072900362961212] |