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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 11 |
| 5 | 16 |
| 6 | 551 |
| 7 | 1190 |
| 8 | 178024 |
| 9 | 564678 |
| 10 | 410606100 |
| 11 | 1876011225 |
| 12 | 6915255136416 |
| 13 | 44675417804160 |
| 14 | 847468391006481244 |
| 15 | 7637169791538787500 |
| 16 | 749927054569389785088000 |
| 17 | 9345619999880270191554560 |
| 18 | 4766524174302701575265292220416 |
| 19 | 81712716729371439637617531305856 |
[1,1,11,16,551,1190,178024,564678,410606100, 1876011225,6915255136416,44675417804160, 847468391006481244,7637169791538787500, 749927054569389785088000, 9345619999880270191554560, 4766524174302701575265292220416, 81712716729371439637617531305856] |