n | a(n) |
---|---|
1 | 1 |
2 | 8 |
3 | 40 |
4 | 176 |
5 | 748 |
6 | 3248 |
7 | 14280 |
8 | 63768 |
9 | 285296 |
10 | 1285688 |
11 | 5794436 |
12 | 26261224 |
13 | 119028156 |
14 | 541876608 |
15 | 2466620624 |
16 | 11267536496 |
17 | 51458718144 |
18 | 235690960392 |
19 | 1079212461992 |
20 | 4953659984000 |
21 | 22730713367468 |
22 | 104520944666808 |
[1,8,40,176,748,3248,14280,63768,285296,1285688, 5794436,26261224,119028156,541876608,2466620624, 11267536496,51458718144,235690960392, 1079212461992,4953659984000,22730713367468, 104520944666808] |