n | a(n) |
---|---|
1 | 2 |
2 | 8 |
3 | 44 |
4 | 240 |
5 | 1248 |
6 | 6224 |
7 | 30052 |
8 | 141536 |
9 | 653744 |
10 | 2973072 |
11 | 13351192 |
12 | 59333408 |
13 | 261378944 |
14 | 1142885664 |
15 | 4965331028 |
16 | 21452209600 |
17 | 92230169232 |
18 | 394819386896 |
19 | 1683663903016 |
20 | 7155148746912 |
21 | 30313584232640 |
22 | 128067598573408 |
[2,8,44,240,1248,6224,30052,141536,653744,2973072, 13351192,59333408,261378944,1142885664,4965331028, 21452209600,92230169232,394819386896, 1683663903016,7155148746912,30313584232640, 128067598573408] |