n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 1 |
7 | 2 |
8 | 5 |
9 | 16 |
10 | 58 |
11 | 264 |
12 | 1535 |
13 | 10755 |
14 | 87973 |
15 | 803973 |
16 | 8020967 |
17 | 86029760 |
18 | 983431053 |
19 | 11913921910 |
20 | 152352965278 |
21 | 2050065073002 |
22 | 28951233955602 |
23 | 428086557232387 |
[0,0,0,0,0,1,1,2,5,16,58,264,1535,10755,87973, 803973,8020967,86029760,983431053,11913921910, 152352965278,2050065073002,28951233955602, 428086557232387] |