n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 23 |
3 | 176 |
4 | 1689 |
5 | 19524 |
6 | 264207 |
7 | 4098240 |
8 | 71697105 |
9 | 1396704420 |
10 | 29985521895 |
11 | 703416314160 |
12 | 17901641997225 |
13 | 491250187505700 |
14 | 14459713484342175 |
15 | 454441401368236800 |
16 | 15188465029114325025 |
17 | 537928935889764226500 |
[1,4,23,176,1689,19524,264207,4098240,71697105, 1396704420,29985521895,703416314160, 17901641997225,491250187505700,14459713484342175, 454441401368236800,15188465029114325025, 537928935889764226500] |