n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 6 |
6 | 15 |
7 | 40 |
8 | 110 |
9 | 303 |
10 | 853 |
11 | 2419 |
12 | 6950 |
13 | 20110 |
14 | 58677 |
15 | 172267 |
16 | 508825 |
17 | 1510472 |
18 | 4504978 |
19 | 13491155 |
20 | 40554394 |
21 | 122318519 |
22 | 370075767 |
23 | 1122830663 |
24 | 3415591776 |
25 | 10414918850 |
26 | 31827804005 |
27 | 97464863424 |
28 | 299032201886 |
29 | 919094334980 |
30 | 2829593105751 |
31 | 8724968220133 |
32 | 26942517476931 |
33 | 83312297368383 |
[1,0,0,1,2,6,15,40,110,303,853,2419,6950,20110, 58677,172267,508825,1510472,4504978,13491155, 40554394,122318519,370075767,1122830663, 3415591776,10414918850,31827804005,97464863424, 299032201886,919094334980,2829593105751, 8724968220133,26942517476931,83312297368383] |