n | a(n) |
---|---|
1 | 0 |
2 | 120 |
3 | 348 |
4 | 2166 |
5 | 9528 |
6 | 44760 |
7 | 198816 |
8 | 877800 |
9 | 3809856 |
10 | 16379232 |
11 | 69769920 |
12 | 295055136 |
13 | 1239952512 |
14 | 5183031744 |
15 | 21564442752 |
16 | 89355535680 |
17 | 368925874944 |
18 | 1518322209600 |
19 | 6230763310464 |
20 | 25503209969088 |
21 | 104143201935360 |
[0,120,348,2166,9528,44760,198816,877800,3809856, 16379232,69769920,295055136,1239952512,5183031744, 21564442752,89355535680,368925874944, 1518322209600,6230763310464,25503209969088, 104143201935360] |