n | a(n) |
---|---|
1 | 0 |
2 | 6 |
3 | 76 |
4 | 312 |
5 | 924 |
6 | 2440 |
7 | 6108 |
8 | 14840 |
9 | 35356 |
10 | 83016 |
11 | 192636 |
12 | 442552 |
13 | 1007868 |
14 | 2277704 |
15 | 5112220 |
16 | 11403768 |
17 | 25297500 |
18 | 55837384 |
19 | 122684220 |
20 | 268436408 |
21 | 585106492 |
[0,6,76,312,924,2440,6108,14840,35356,83016, 192636,442552,1007868,2277704,5112220,11403768, 25297500,55837384,122684220,268436408,585106492] |