n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 51 |
5 | 189 |
6 | 748 |
7 | 3128 |
8 | 13731 |
9 | 62969 |
10 | 300552 |
11 | 1488704 |
12 | 7634723 |
13 | 40464741 |
14 | 221311617 |
15 | 1247444859 |
16 | 7238458309 |
17 | 43196661875 |
18 | 264878725516 |
19 | 1667564565616 |
20 | 10770316016557 |
21 | 71314258947903 |
22 | 483765644021787 |
23 | 3359905164274725 |
[1,2,5,15,51,189,748,3128,13731,62969,300552, 1488704,7634723,40464741,221311617,1247444859, 7238458309,43196661875,264878725516,1667564565616, 10770316016557,71314258947903,483765644021787, 3359905164274725] |