n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 13 |
6 | 44 |
7 | 173 |
8 | 792 |
9 | 4009 |
10 | 21608 |
11 | 122761 |
12 | 737340 |
13 | 4696341 |
14 | 31665076 |
15 | 224846037 |
16 | 1672266352 |
17 | 12976252561 |
18 | 104816144656 |
19 | 880061135057 |
20 | 7670326372532 |
21 | 69286959112797 |
22 | 647568753568636 |
23 | 6251768635591613 |
24 | 62255057942504968 |
25 | 638658964709824185 |
[0,1,0,1,4,13,44,173,792,4009,21608,122761,737340, 4696341,31665076,224846037,1672266352,12976252561, 104816144656,880061135057,7670326372532, 69286959112797,647568753568636,6251768635591613, 62255057942504968,638658964709824185] |