n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 45 |
6 | 142 |
7 | 464 |
8 | 1556 |
9 | 5327 |
10 | 18532 |
11 | 65326 |
12 | 232826 |
13 | 837589 |
14 | 3037472 |
15 | 11092143 |
16 | 40753626 |
17 | 150541422 |
18 | 558762382 |
19 | 2082871613 |
20 | 7794301294 |
21 | 29269317708 |
22 | 110263451242 |
23 | 416595676681 |
24 | 1578183767068 |
25 | 5993326380378 |
26 | 22812048907856 |
27 | 87010994947971 |
28 | 332531385362972 |
[1,1,2,5,15,45,142,464,1556,5327,18532,65326, 232826,837589,3037472,11092143,40753626,150541422, 558762382,2082871613,7794301294,29269317708, 110263451242,416595676681,1578183767068, 5993326380378,22812048907856,87010994947971, 332531385362972] |