n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 22 |
4 | 136 |
5 | 897 |
6 | 6168 |
7 | 43670 |
8 | 315956 |
9 | 2324479 |
10 | 17329828 |
11 | 130605478 |
12 | 993182984 |
13 | 7610051579 |
14 | 58689316888 |
15 | 455159096044 |
[1,4,22,136,897,6168,43670,315956,2324479, 17329828,130605478,993182984,7610051579, 58689316888,455159096044] |