n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 10 |
6 | 24 |
7 | 70 |
8 | 192 |
9 | 576 |
10 | 1890 |
11 | 6300 |
12 | 21600 |
13 | 78848 |
14 | 294840 |
15 | 1143072 |
16 | 4572288 |
17 | 18849600 |
18 | 79968000 |
19 | 348566400 |
20 | 1559376000 |
21 | 7147140000 |
22 | 33522128640 |
23 | 160758097500 |
24 | 787652812800 |
25 | 3938264064000 |
26 | 20080974513600 |
27 | 104348440350000 |
28 | 552160113120000 |
[1,1,2,4,10,24,70,192,576,1890,6300,21600,78848, 294840,1143072,4572288,18849600,79968000, 348566400,1559376000,7147140000,33522128640, 160758097500,787652812800,3938264064000, 20080974513600,104348440350000,552160113120000] |