n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 66 |
5 | 228 |
6 | 804 |
7 | 2872 |
8 | 10374 |
9 | 37780 |
10 | 138436 |
11 | 509832 |
12 | 1885396 |
13 | 6996472 |
14 | 26039592 |
15 | 97160592 |
16 | 363332534 |
17 | 1361320284 |
18 | 5109306148 |
19 | 19205627608 |
20 | 72292274076 |
21 | 272454449560 |
22 | 1027979651384 |
23 | 3882579544656 |
24 | 14677889406396 |
25 | 55536827825096 |
[1,2,6,20,66,228,804,2872,10374,37780,138436, 509832,1885396,6996472,26039592,97160592, 363332534,1361320284,5109306148,19205627608, 72292274076,272454449560,1027979651384, 3882579544656,14677889406396,55536827825096] |