n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 23 |
3 | 141 |
4 | 888 |
5 | 5675 |
6 | 36602 |
7 | 237563 |
8 | 1548995 |
9 | 10135554 |
10 | 66504699 |
11 | 437359454 |
12 | 2881641263 |
13 | 19016505326 |
14 | 125664684700 |
15 | 831400186740 |
16 | 5506287269802 |
17 | 36501297800013 |
18 | 242167539749593 |
19 | 1607851773270316 |
20 | 10682384379036741 |
21 | 71016046921543562 |
22 | 472376627798814453 |
[1,4,23,141,888,5675,36602,237563,1548995, 10135554,66504699,437359454,2881641263, 19016505326,125664684700,831400186740, 5506287269802,36501297800013,242167539749593, 1607851773270316,10682384379036741, 71016046921543562,472376627798814453] |