n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 8 |
6 | 18 |
7 | 61 |
8 | 170 |
9 | 538 |
10 | 1654 |
11 | 5344 |
12 | 17252 |
13 | 57146 |
14 | 190786 |
15 | 646305 |
16 | 2209050 |
17 | 7626164 |
18 | 26532732 |
19 | 93013852 |
20 | 328196780 |
21 | 1165060170 |
22 | 4158266282 |
23 | 14915635376 |
24 | 53745892932 |
25 | 194477856048 |
26 | 706436256598 |
27 | 2575316698792 |
28 | 9419568272632 |
[1,1,0,1,2,8,18,61,170,538,1654,5344,17252,57146, 190786,646305,2209050,7626164,26532732,93013852, 328196780,1165060170,4158266282,14915635376, 53745892932,194477856048,706436256598, 2575316698792,9419568272632] |