n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 4 |
7 | 14 |
8 | 60 |
9 | 210 |
10 | 728 |
11 | 2442 |
12 | 8252 |
13 | 27716 |
14 | 93924 |
15 | 319964 |
16 | 1098900 |
17 | 3800928 |
18 | 13244836 |
19 | 46460738 |
20 | 164015272 |
21 | 582353976 |
22 | 2078812492 |
23 | 7457141650 |
24 | 26871707908 |
25 | 97236327900 |
26 | 353213328024 |
27 | 1287648322950 |
28 | 4709765510884 |
29 | 17279999438748 |
30 | 63583033400968 |
[0,0,0,0,0,4,14,60,210,728,2442,8252,27716,93924, 319964,1098900,3800928,13244836,46460738, 164015272,582353976,2078812492,7457141650, 26871707908,97236327900,353213328024, 1287648322950,4709765510884,17279999438748, 63583033400968] |