n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 4 |
3 | 14 |
4 | 72 |
5 | 346 |
6 | 1612 |
7 | 7526 |
8 | 35216 |
9 | 164786 |
10 | 770964 |
11 | 3606974 |
12 | 16875480 |
13 | 78953226 |
14 | 369388508 |
15 | 1728211222 |
16 | 8085563168 |
17 | 37828901730 |
18 | 176985297700 |
19 | 828038725486 |
20 | 3874040046440 |
21 | 18124981139642 |
22 | 84799056637292 |
23 | 396738620092614 |
[0,2,4,14,72,346,1612,7526,35216,164786,770964, 3606974,16875480,78953226,369388508,1728211222, 8085563168,37828901730,176985297700,828038725486, 3874040046440,18124981139642,84799056637292, 396738620092614] |