n | a(n) |
---|---|
1 | 4 |
2 | 16 |
3 | 68 |
4 | 232 |
5 | 796 |
6 | 2528 |
7 | 8036 |
8 | 24520 |
9 | 74796 |
10 | 222400 |
11 | 660868 |
12 | 1929944 |
13 | 5631748 |
14 | 16228768 |
15 | 46730860 |
16 | 133288872 |
17 | 379917092 |
18 | 1074853312 |
19 | 3039122932 |
20 | 8541661232 |
21 | 23994293596 |
22 | 67070070848 |
23 | 187391828604 |
[4,16,68,232,796,2528,8036,24520,74796,222400, 660868,1929944,5631748,16228768,46730860, 133288872,379917092,1074853312,3039122932, 8541661232,23994293596,67070070848,187391828604] |