n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 80 |
6 | 240 |
7 | 896 |
8 | 3584 |
9 | 15360 |
10 | 65792 |
11 | 270336 |
12 | 1081344 |
13 | 4259840 |
14 | 16773120 |
15 | 66584576 |
16 | 266338304 |
17 | 1069547520 |
18 | 4295032832 |
19 | 17213423616 |
20 | 68853694464 |
21 | 275146342400 |
22 | 1099510579200 |
23 | 4395899027456 |
24 | 17583596109824 |
25 | 70351564308480 |
26 | 281474993487872 |
[0,2,6,24,80,240,896,3584,15360,65792,270336, 1081344,4259840,16773120,66584576,266338304, 1069547520,4295032832,17213423616,68853694464, 275146342400,1099510579200,4395899027456, 17583596109824,70351564308480,281474993487872] |