n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 15 |
5 | 58 |
6 | 232 |
7 | 954 |
8 | 4010 |
9 | 17156 |
10 | 74469 |
11 | 327168 |
12 | 1452075 |
13 | 6501156 |
14 | 29326743 |
15 | 133166064 |
16 | 608188737 |
17 | 2791992736 |
18 | 12876049123 |
19 | 59626721244 |
20 | 277150709717 |
21 | 1292583258866 |
22 | 6046985696778 |
23 | 28369001791034 |
24 | 133436435891480 |
[0,0,1,4,15,58,232,954,4010,17156,74469,327168, 1452075,6501156,29326743,133166064,608188737, 2791992736,12876049123,59626721244,277150709717, 1292583258866,6046985696778,28369001791034, 133436435891480] |