n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 4 |
8 | 14 |
9 | 45 |
10 | 135 |
11 | 391 |
12 | 1105 |
13 | 3067 |
14 | 8404 |
15 | 22806 |
16 | 61428 |
17 | 164495 |
18 | 438459 |
19 | 1164363 |
20 | 3082717 |
21 | 8141422 |
22 | 21457255 |
23 | 56455195 |
24 | 148323305 |
25 | 389213825 |
26 | 1020283146 |
27 | 2672225692 |
28 | 6993600748 |
29 | 18291536552 |
30 | 47814575243 |
31 | 124929304664 |
32 | 326280023426 |
[0,0,0,0,0,0,1,4,14,45,135,391,1105,3067,8404, 22806,61428,164495,438459,1164363,3082717,8141422, 21457255,56455195,148323305,389213825,1020283146, 2672225692,6993600748,18291536552,47814575243, 124929304664,326280023426] |