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| n | a(n) |
|---|---|
| 4 | 24 |
| 5 | 504 |
| 6 | 6840 |
| 7 | 103776 |
| 8 | 1481430 |
| 9 | 23148840 |
| 10 | 370145514 |
| 11 | 6239664480 |
| 12 | 108190392360 |
| 13 | 1946102171640 |
| 14 | 35845601561076 |
| 15 | 677067443453190 |
| 16 | 13040933356636620 |
| 17 | 255861630224692890 |
| 18 | 5098732402525355154 |
| 19 | 103074299201812858200 |
| 20 | 2110069526732687732856 |
| 21 | 43695406785298898577360 |
| 22 | 914231452074242154776820 |
[24,504,6840,103776,1481430,23148840,370145514, 6239664480,108190392360,1946102171640, 35845601561076,677067443453190,13040933356636620, 255861630224692890,5098732402525355154, 103074299201812858200,2110069526732687732856, 43695406785298898577360,914231452074242154776820] |