n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 4 |
5 | 13 |
6 | 42 |
7 | 119 |
8 | 330 |
9 | 890 |
10 | 2376 |
11 | 6291 |
12 | 16588 |
13 | 43615 |
14 | 114492 |
15 | 300236 |
16 | 786828 |
17 | 2061233 |
18 | 5398470 |
19 | 14136759 |
20 | 37015990 |
21 | 96917974 |
22 | 253748880 |
23 | 664346375 |
24 | 1739318904 |
25 | 4553656703 |
26 | 11921726232 |
27 | 31211643384 |
28 | 81713400340 |
29 | 213928875445 |
30 | 560073740226 |
[0,0,0,0,4,13,42,119,330,890,2376,6291,16588, 43615,114492,300236,786828,2061233,5398470, 14136759,37015990,96917974,253748880,664346375, 1739318904,4553656703,11921726232,31211643384, 81713400340,213928875445,560073740226] |