n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 13 |
4 | 66 |
5 | 406 |
6 | 2602 |
7 | 17271 |
8 | 118444 |
9 | 829514 |
10 | 5914980 |
11 | 42791085 |
12 | 313277294 |
13 | 2316793170 |
14 | 17281455882 |
15 | 129867946828 |
16 | 982293317064 |
17 | 7472406051744 |
18 | 57132051350160 |
19 | 438797394096378 |
20 | 3383870656327576 |
21 | 26191385476141936 |
[1,1,2,13,66,406,2602,17271,118444,829514,5914980, 42791085,313277294,2316793170,17281455882, 129867946828,982293317064,7472406051744, 57132051350160,438797394096378,3383870656327576, 26191385476141936] |