n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 7 |
6 | 19 |
7 | 47 |
8 | 117 |
9 | 284 |
10 | 675 |
11 | 1575 |
12 | 3634 |
13 | 8312 |
14 | 18881 |
15 | 42634 |
16 | 95797 |
17 | 214376 |
18 | 478110 |
19 | 1063242 |
20 | 2358703 |
21 | 5221606 |
22 | 11538623 |
23 | 25458412 |
24 | 56095424 |
25 | 123458153 |
26 | 271440387 |
27 | 596277224 |
28 | 1308849869 |
29 | 2871054209 |
30 | 6294182153 |
31 | 13791615999 |
32 | 30206220592 |
33 | 66131277054 |
[0,0,0,0,2,7,19,47,117,284,675,1575,3634,8312, 18881,42634,95797,214376,478110,1063242,2358703, 5221606,11538623,25458412,56095424,123458153, 271440387,596277224,1308849869,2871054209, 6294182153,13791615999,30206220592,66131277054] |