n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 4 |
3 | 14 |
4 | 56 |
5 | 282 |
6 | 1692 |
7 | 11846 |
8 | 94768 |
9 | 852914 |
10 | 8529140 |
11 | 93820542 |
12 | 1125846504 |
13 | 14636004554 |
14 | 204904063756 |
15 | 3073560956342 |
16 | 49176975301472 |
17 | 836008580125026 |
18 | 15048154442250468 |
19 | 285914934402758894 |
20 | 5718298688055177880 |
21 | 120084272449158735482 |
22 | 2641853993881492180604 |
[0,2,4,14,56,282,1692,11846,94768,852914,8529140, 93820542,1125846504,14636004554,204904063756, 3073560956342,49176975301472,836008580125026, 15048154442250468,285914934402758894, 5718298688055177880,120084272449158735482, 2641853993881492180604] |