n | a(n) |
---|---|
1 | 2 |
2 | 10 |
3 | 49 |
4 | 168 |
5 | 557 |
6 | 1758 |
7 | 5441 |
8 | 16500 |
9 | 49253 |
10 | 145290 |
11 | 424425 |
12 | 1229824 |
13 | 3539405 |
14 | 10127350 |
15 | 28832593 |
16 | 81728396 |
17 | 230776757 |
18 | 649427170 |
19 | 1821994809 |
20 | 5097729560 |
21 | 14227693853 |
22 | 39620451150 |
23 | 110107647905 |
24 | 305424435364 |
25 | 845754303493 |
[2,10,49,168,557,1758,5441,16500,49253,145290, 424425,1229824,3539405,10127350,28832593,81728396, 230776757,649427170,1821994809,5097729560, 14227693853,39620451150,110107647905,305424435364, 845754303493] |