n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 52 |
5 | 201 |
6 | 841 |
7 | 3726 |
8 | 17213 |
9 | 82047 |
10 | 400600 |
11 | 1993377 |
12 | 10071777 |
13 | 51532938 |
14 | 266462229 |
15 | 1390174911 |
16 | 7308741084 |
17 | 38682855225 |
18 | 205940368441 |
19 | 1102091393574 |
20 | 5925177392573 |
21 | 31987877317887 |
22 | 173337754977904 |
[1,2,5,15,52,201,841,3726,17213,82047,400600, 1993377,10071777,51532938,266462229,1390174911, 7308741084,38682855225,205940368441,1102091393574, 5925177392573,31987877317887,173337754977904] |