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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | -6 |
| 4 | 14 |
| 5 | -25 |
| 6 | 32 |
| 7 | 6 |
| 8 | -250 |
| 9 | 1222 |
| 10 | -4380 |
| 11 | 13059 |
| 12 | -31705 |
| 13 | 48464 |
| 14 | 76354 |
| 15 | -1159911 |
| 16 | 7041015 |
| 17 | -33400183 |
| 18 | 135931668 |
| 19 | -473704510 |
| 20 | 1277600695 |
| 21 | -1233828142 |
| 22 | -16196871172 |
| 23 | 169736941512 |
| 24 | -1156974034428 |
| 25 | 6577630531262 |
[1,1,1,-6,14,-25,32,6,-250,1222,-4380,13059, -31705,48464,76354,-1159911,7041015,-33400183, 135931668,-473704510,1277600695,-1233828142, -16196871172,169736941512,-1156974034428, 6577630531262] |