n | a(n) |
---|---|
0 | 1 |
1 | 7 |
2 | 21 |
3 | 112 |
4 | 588 |
5 | 3360 |
6 | 19544 |
7 | 117648 |
8 | 720300 |
9 | 4483696 |
10 | 28245840 |
11 | 179756976 |
12 | 1153430600 |
13 | 7453000800 |
14 | 48444446376 |
15 | 316504099520 |
16 | 2077057800300 |
17 | 13684147881600 |
18 | 90467419857752 |
19 | 599941851861744 |
[1,7,21,112,588,3360,19544,117648,720300,4483696, 28245840,179756976,1153430600,7453000800, 48444446376,316504099520,2077057800300, 13684147881600,90467419857752,599941851861744] |