n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 42 |
3 | 312 |
4 | 2394 |
5 | 18756 |
6 | 149136 |
7 | 1199232 |
8 | 9729882 |
9 | 79527084 |
10 | 654089292 |
11 | 5408896752 |
12 | 44941609584 |
13 | 375002110944 |
14 | 3141107339328 |
15 | 26402533581312 |
16 | 222635989516122 |
17 | 1882882811380284 |
18 | 15967419789558804 |
19 | 135752058036988848 |
20 | 1156869080242393644 |
[1,6,42,312,2394,18756,149136,1199232,9729882, 79527084,654089292,5408896752,44941609584, 375002110944,3141107339328,26402533581312, 222635989516122,1882882811380284, 15967419789558804,135752058036988848, 1156869080242393644] |