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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 82 |
| 5 | 1024 |
| 6 | 15690 |
| 7 | 279936 |
| 8 | 5771363 |
| 9 | 134218240 |
| 10 | 3487832978 |
| 11 | 100000000000 |
| 12 | 3138673052884 |
| 13 | 106993205379072 |
| 14 | 3937454749863386 |
| 15 | 155568096631586816 |
| 16 | 6568441588686506948 |
| 17 | 295147905179352825856 |
| 18 | 14063102470280932000763 |
| 19 | 708235345355337676357632 |
[1,0,1,8,82,1024,15690,279936,5771363,134218240, 3487832978,100000000000,3138673052884, 106993205379072,3937454749863386, 155568096631586816,6568441588686506948, 295147905179352825856,14063102470280932000763, 708235345355337676357632] |