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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 10 |
| 6 | 65 |
| 7 | 350 |
| 8 | 1736 |
| 9 | 9030 |
| 10 | 60355 |
| 11 | 561550 |
| 12 | 6188996 |
| 13 | 69919850 |
| 14 | 781211795 |
| 15 | 8854058850 |
| 16 | 106994019406 |
| 17 | 1433756147470 |
| 18 | 21287253921635 |
| 19 | 339206526695750 |
| 20 | 5630710652048216 |
| 21 | 96341917117951890 |
| 22 | 1708973354556320875 |
| 23 | 31787279786739738250 |
| 24 | 623964823224788294426 |
[1,10,65,350,1736,9030,60355,561550,6188996, 69919850,781211795,8854058850,106994019406, 1433756147470,21287253921635,339206526695750, 5630710652048216,96341917117951890, 1708973354556320875,31787279786739738250, 623964823224788294426] |