n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 8 |
6 | 23 |
7 | 68 |
8 | 207 |
9 | 644 |
10 | 2040 |
11 | 6558 |
12 | 21343 |
13 | 70186 |
14 | 232864 |
15 | 778550 |
16 | 2620459 |
17 | 8872074 |
18 | 30195288 |
19 | 103246502 |
20 | 354508628 |
21 | 1221846856 |
22 | 4225644866 |
23 | 14659644348 |
24 | 51002664023 |
25 | 177909901566 |
26 | 622093882290 |
27 | 2180123564130 |
28 | 7656055966092 |
[1,1,1,3,8,23,68,207,644,2040,6558,21343,70186, 232864,778550,2620459,8872074,30195288,103246502, 354508628,1221846856,4225644866,14659644348, 51002664023,177909901566,622093882290, 2180123564130,7656055966092] |