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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 24 |
| 3 | 110 |
| 4 | 480 |
| 5 | 2000 |
| 6 | 8064 |
| 7 | 32240 |
| 8 | 130560 |
| 9 | 531200 |
| 10 | 2095104 |
| 11 | 8030720 |
| 12 | 33546240 |
| 13 | 156569600 |
| 14 | 536838144 |
| 15 | 243660800 |
| 16 | 8589803520 |
| 17 | 244224819200 |
| 18 | 137438429184 |
| 19 | -28539130347520 |
| 20 | 2199021158400 |
| 21 | 4960294141952000 |
| 22 | 35184363700224 |
| 23 | -1015283149035274240 |
| 24 | 562949919866880 |
[1,5,24,110,480,2000,8064,32240,130560,531200, 2095104,8030720,33546240,156569600,536838144, 243660800,8589803520,244224819200,137438429184, -28539130347520,2199021158400,4960294141952000, 35184363700224,-1015283149035274240, 562949919866880] |