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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 36 |
| 10 | 750 |
| 11 | 11880 |
| 12 | 159027 |
| 13 | 1899612 |
| 14 | 20912320 |
| 15 | 216627840 |
| 16 | 2141770488 |
| 17 | 20416870188 |
| 18 | 189100389270 |
| 19 | 1713143123640 |
| 20 | 15314761051669 |
| 21 | 137723007972924 |
| 22 | 1310008783707360 |
| 23 | 14647748873844240 |
| 24 | 215375952901752225 |
| 25 | 4079250159907459680 |
[1,0,0,0,0,0,0,0,1,36,750,11880,159027,1899612, 20912320,216627840,2141770488,20416870188, 189100389270,1713143123640,15314761051669, 137723007972924,1310008783707360, 14647748873844240,215375952901752225, 4079250159907459680] |