n | a(n) |
---|---|
0 | 1 |
1 | 7 |
2 | 42 |
3 | 252 |
4 | 1512 |
5 | 9072 |
6 | 54432 |
7 | 326592 |
8 | 1959552 |
9 | 11757312 |
10 | 70543872 |
11 | 423263232 |
12 | 2539579392 |
13 | 15237476352 |
14 | 91424858112 |
15 | 548549148672 |
16 | 3291294892032 |
17 | 19747769352192 |
18 | 118486616113152 |
19 | 710919696678912 |
20 | 4265518180073472 |
21 | 25593109080440832 |
22 | 153558654482644992 |
[1,7,42,252,1512,9072,54432,326592,1959552, 11757312,70543872,423263232,2539579392, 15237476352,91424858112,548549148672, 3291294892032,19747769352192,118486616113152, 710919696678912,4265518180073472, 25593109080440832,153558654482644992] |