n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 54 |
4 | 492 |
5 | 5400 |
6 | 68520 |
7 | 987000 |
8 | 15928080 |
9 | 284588640 |
10 | 5570994240 |
11 | 118432147680 |
12 | 2714315123520 |
13 | 66662973336960 |
14 | 1745585471710080 |
15 | 48522632817859200 |
16 | 1426443527673964800 |
17 | 44200671544495065600 |
18 | 1439417651948346470400 |
19 | 49134301244829555955200 |
[1,2,8,54,492,5400,68520,987000,15928080, 284588640,5570994240,118432147680,2714315123520, 66662973336960,1745585471710080,48522632817859200, 1426443527673964800,44200671544495065600, 1439417651948346470400,49134301244829555955200] |