n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 69 |
5 | 242 |
6 | 858 |
7 | 3068 |
8 | 11050 |
9 | 40052 |
10 | 145996 |
11 | 534888 |
12 | 1968685 |
13 | 7276050 |
14 | 26993490 |
15 | 100490220 |
16 | 375287550 |
17 | 1405622460 |
18 | 5278838100 |
19 | 19873977240 |
20 | 74994427170 |
21 | 283595947284 |
22 | 1074568266756 |
23 | 4079184055640 |
24 | 15511924233204 |
25 | 59083160374952 |
26 | 225384613313944 |
[1,2,6,20,69,242,858,3068,11050,40052,145996, 534888,1968685,7276050,26993490,100490220, 375287550,1405622460,5278838100,19873977240, 74994427170,283595947284,1074568266756, 4079184055640,15511924233204,59083160374952, 225384613313944] |