n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 100 |
6 | 326 |
7 | 2114 |
8 | 9226 |
9 | 47220 |
10 | 233480 |
11 | 1135788 |
12 | 5678402 |
13 | 27785526 |
14 | 137642146 |
15 | 678271020 |
16 | 3346581344 |
17 | 16519160048 |
18 | 81474120774 |
19 | 402103867046 |
20 | 1983757394910 |
21 | 9788422760352 |
22 | 48296742499360 |
23 | 238296850975076 |
[0,2,4,12,100,326,2114,9226,47220,233480,1135788, 5678402,27785526,137642146,678271020,3346581344, 16519160048,81474120774,402103867046, 1983757394910,9788422760352,48296742499360, 238296850975076] |