n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 4 |
6 | 6 |
7 | 19 |
8 | 38 |
9 | 107 |
10 | 247 |
11 | 668 |
12 | 1666 |
13 | 4468 |
14 | 11603 |
15 | 31210 |
16 | 83044 |
17 | 224893 |
18 | 607658 |
19 | 1657966 |
20 | 4528193 |
21 | 12441364 |
22 | 34254321 |
23 | 94696165 |
24 | 262389581 |
25 | 729258392 |
26 | 2031264865 |
27 | 5671570468 |
28 | 15867219821 |
29 | 44480785907 |
30 | 124913622052 |
31 | 351393746745 |
32 | 990048748684 |
[0,1,0,1,1,4,6,19,38,107,247,668,1666,4468,11603, 31210,83044,224893,607658,1657966,4528193, 12441364,34254321,94696165,262389581,729258392, 2031264865,5671570468,15867219821,44480785907, 124913622052,351393746745,990048748684] |