n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 27 |
4 | 252 |
5 | 2935 |
6 | 40351 |
7 | 633864 |
8 | 11139840 |
9 | 215800335 |
10 | 4557031407 |
11 | 103989209082 |
12 | 2546369980589 |
13 | 66521801043100 |
14 | 1845008781481516 |
15 | 54102505102771686 |
16 | 1671315770146956704 |
17 | 54219694639758864087 |
18 | 1842085959295755494339 |
19 | 65380444351870047159358 |
[1,1,4,27,252,2935,40351,633864,11139840, 215800335,4557031407,103989209082,2546369980589, 66521801043100,1845008781481516,54102505102771686, 1671315770146956704,54219694639758864087, 1842085959295755494339,65380444351870047159358] |