n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 1 |
8 | 7 |
9 | 13 |
10 | 55 |
11 | 127 |
12 | 435 |
13 | 1110 |
14 | 3458 |
15 | 9261 |
16 | 27460 |
17 | 75305 |
18 | 217619 |
19 | 603618 |
20 | 1720712 |
21 | 4799095 |
22 | 13580179 |
23 | 37979149 |
24 | 107045222 |
25 | 299800569 |
26 | 843242264 |
27 | 2363693561 |
28 | 6641675073 |
29 | 18628827667 |
30 | 52325428340 |
[0,0,0,0,0,1,1,7,13,55,127,435,1110,3458,9261, 27460,75305,217619,603618,1720712,4799095, 13580179,37979149,107045222,299800569,843242264, 2363693561,6641675073,18628827667,52325428340] |