n | a(n) |
---|---|
1 | 1 |
2 | 8 |
3 | 45 |
4 | 416 |
5 | 1685 |
6 | 31032 |
7 | 229026 |
8 | 13856896 |
9 | 132843888 |
10 | 6551143600 |
11 | 672567897859 |
12 | 346984064352 |
13 | 51233511973865 |
14 | 99704578224832 |
15 | 1521740934249300 |
16 | 87595020192056292864 |
17 | 81891555365769626429 |
18 | 12883000343953567644 |
19 | 318718123756704667891346 |
20 | 50107182570391966040000 |
21 | 500792393469899639083500 |
[1,8,45,416,1685,31032,229026,13856896,132843888, 6551143600,672567897859,346984064352, 51233511973865,99704578224832,1521740934249300, 87595020192056292864,81891555365769626429, 12883000343953567644,318718123756704667891346, 50107182570391966040000,500792393469899639083500] |