n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 12 |
3 | 54 |
4 | 224 |
5 | 906 |
6 | 3636 |
7 | 14558 |
8 | 58248 |
9 | 233010 |
10 | 932060 |
11 | 3728262 |
12 | 14913072 |
13 | 59652314 |
14 | 238609284 |
15 | 954437166 |
16 | 3817748696 |
17 | 15270994818 |
18 | 61083979308 |
19 | 244335917270 |
20 | 977343669120 |
21 | 3909374676522 |
22 | 15637498706132 |
23 | 62549994824574 |
[0,2,12,54,224,906,3636,14558,58248,233010,932060, 3728262,14913072,59652314,238609284,954437166, 3817748696,15270994818,61083979308,244335917270, 977343669120,3909374676522,15637498706132, 62549994824574] |