| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 66 |
| 7 | 392 |
| 8 | 3522 |
| 9 | 15699 |
| 10 | 104014 |
| 11 | 463811 |
| 12 | 2735525 |
| 13 | 12858073 |
| 14 | 74523350 |
| 15 | 369725340 |
| 16 | 2110660483 |
| 17 | 10653316753 |
| 18 | 59256398945 |
| 19 | 300481718854 |
| 20 | 1633653025795 |
| 21 | 8329842362903 |
| 22 | 44742563812167 |
| 23 | 229817730687508 |
| 24 | 1226116608834208 |
[0,0,0,1,5,66,392,3522,15699,104014,463811, 2735525,12858073,74523350,369725340,2110660483, 10653316753,59256398945,300481718854, 1633653025795,8329842362903,44742563812167, 229817730687508,1226116608834208] |