n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 4 |
7 | 37 |
8 | 381 |
9 | 2717 |
10 | 18760 |
11 | 116439 |
12 | 565943 |
13 | 3033697 |
14 | 14835067 |
15 | 72633658 |
16 | 356923880 |
17 | 1746833634 |
18 | 8532601529 |
19 | 41868336466 |
20 | 205618704167 |
21 | 1012359995953 |
[0,0,0,0,0,4,37,381,2717,18760,116439,565943, 3033697,14835067,72633658,356923880,1746833634, 8532601529,41868336466,205618704167,1012359995953] |