n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 21 |
4 | 91 |
5 | 336 |
6 | 1337 |
7 | 5026 |
8 | 19193 |
9 | 71769 |
10 | 268272 |
11 | 992676 |
12 | 3659116 |
13 | 13400426 |
14 | 48863017 |
15 | 177299790 |
16 | 640713627 |
17 | 2305930966 |
18 | 8268556438 |
19 | 29544196129 |
20 | 105215495691 |
21 | 373523546056 |
22 | 1322096328899 |
23 | 4666327388034 |
24 | 16425341129078 |
25 | 57667752483279 |
26 | 201967215942032 |
[1,1,6,21,91,336,1337,5026,19193,71769,268272, 992676,3659116,13400426,48863017,177299790, 640713627,2305930966,8268556438,29544196129, 105215495691,373523546056,1322096328899, 4666327388034,16425341129078,57667752483279, 201967215942032] |