n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 28 |
6 | 96 |
7 | 304 |
8 | 928 |
9 | 2784 |
10 | 8504 |
11 | 26124 |
12 | 80228 |
13 | 245544 |
14 | 751168 |
15 | 2299184 |
16 | 7040986 |
17 | 21561028 |
18 | 66015398 |
19 | 202114264 |
20 | 618817376 |
21 | 1894692160 |
22 | 5801169248 |
23 | 17761879056 |
24 | 54382725520 |
25 | 166507388264 |
26 | 509808051944 |
27 | 1560917463152 |
28 | 4779176035680 |
[0,0,2,4,10,28,96,304,928,2784,8504,26124,80228, 245544,751168,2299184,7040986,21561028,66015398, 202114264,618817376,1894692160,5801169248, 17761879056,54382725520,166507388264,509808051944, 1560917463152,4779176035680] |