n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 24 |
4 | 98 |
5 | 400 |
6 | 1785 |
7 | 7980 |
8 | 37674 |
9 | 178164 |
10 | 874146 |
11 | 4294752 |
12 | 21667932 |
13 | 109436184 |
14 | 563910633 |
15 | 2908233900 |
16 | 15235550330 |
17 | 79870553620 |
18 | 424021948350 |
19 | 2252356700880 |
20 | 12088746573540 |
21 | 64913104882080 |
22 | 351594254659830 |
23 | 1905139854213960 |
24 | 10399223643879420 |
25 | 56783986550235000 |
[1,2,7,24,98,400,1785,7980,37674,178164,874146, 4294752,21667932,109436184,563910633,2908233900, 15235550330,79870553620,424021948350, 2252356700880,12088746573540,64913104882080, 351594254659830,1905139854213960, 10399223643879420,56783986550235000] |