n | a(n) |
---|---|
2 | 1 |
3 | 9 |
4 | 70 |
5 | 535 |
6 | 4101 |
7 | 31633 |
8 | 245512 |
9 | 1915875 |
10 | 15020545 |
11 | 118231212 |
12 | 933812892 |
13 | 7397179309 |
14 | 58746824150 |
15 | 467602683135 |
16 | 3729318261224 |
17 | 29795160492299 |
18 | 238421091129957 |
19 | 1910544426355420 |
20 | 15329353155160880 |
21 | 123138401704273620 |
[1,9,70,535,4101,31633,245512,1915875,15020545, 118231212,933812892,7397179309,58746824150, 467602683135,3729318261224,29795160492299, 238421091129957,1910544426355420, 15329353155160880,123138401704273620] |