n | a(n) |
---|---|
2 | 1 |
3 | 7 |
4 | 32 |
5 | 160 |
6 | 832 |
7 | 4424 |
8 | 23872 |
9 | 130176 |
10 | 715520 |
11 | 3957448 |
12 | 21998176 |
13 | 122786976 |
14 | 687736896 |
15 | 3863423880 |
16 | 21758302848 |
17 | 122811081216 |
18 | 694533774336 |
19 | 3934558067336 |
20 | 22323615621280 |
21 | 126832567223712 |
22 | 721500116473664 |
[1,7,32,160,832,4424,23872,130176,715520,3957448, 21998176,122786976,687736896,3863423880, 21758302848,122811081216,694533774336, 3934558067336,22323615621280,126832567223712, 721500116473664] |