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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 294356160 |
| 7 | 21868600320 |
| 8 | 1079676716580 |
| 9 | 32718315893760 |
| 10 | 695158793614656 |
| 11 | 11026038938342400 |
| 12 | 137497720603279680 |
| 13 | 1400862276406010880 |
| 14 | 12015767981918796480 |
| 15 | 88855610036013821952 |
| 16 | 577454719930538800140 |
[1,0,0,0,0,0,294356160,21868600320,1079676716580, 32718315893760,695158793614656,11026038938342400, 137497720603279680,1400862276406010880, 12015767981918796480,88855610036013821952, 577454719930538800140] |