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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 4 |
| 4 | 35 |
| 5 | 1812 |
| 6 | 170240 |
| 7 | 46301673 |
| 8 | 30413016864 |
| 9 | 52171354014208 |
| 10 | 228072747428273319 |
| 11 | 2583414317082067853704 |
| 12 | 75732718487930382583857152 |
| 13 | 5773860969402842827019263155009 |
| 14 | 1146353725688692827225795357533033072 |
| 15 | 593830518002528577221255815133242142736384 |
[1,0,4,35,1812,170240,46301673,30413016864, 52171354014208,228072747428273319, 2583414317082067853704,75732718487930382583857152, 5773860969402842827019263155009, 1146353725688692827225795357533033072, 593830518002528577221255815133242142736384] |