n | a(n) |
---|---|
0 | 2 |
1 | 3 |
2 | 6 |
3 | 17 |
4 | 66 |
5 | 327 |
6 | 1958 |
7 | 13701 |
8 | 109602 |
9 | 986411 |
10 | 9864102 |
11 | 108505113 |
12 | 1302061346 |
13 | 16926797487 |
14 | 236975164806 |
15 | 3554627472077 |
16 | 56874039553218 |
17 | 966858672404691 |
18 | 17403456103284422 |
19 | 330665665962404001 |
20 | 6613313319248080002 |
[2,3,6,17,66,327,1958,13701,109602,986411,9864102, 108505113,1302061346,16926797487,236975164806, 3554627472077,56874039553218,966858672404691, 17403456103284422,330665665962404001, 6613313319248080002] |