n | a(n) |
---|---|
0 | 1 |
1 | 22 |
2 | 252 |
3 | 2002 |
4 | 12396 |
5 | 63734 |
6 | 283107 |
7 | 1116236 |
8 | 3983485 |
9 | 13057330 |
10 | 39764011 |
11 | 113533312 |
12 | 306173263 |
13 | 784654154 |
14 | 1920802566 |
15 | 4510960122 |
16 | 10201294213 |
17 | 22286443124 |
18 | 47167714715 |
19 | 96947735390 |
20 | 193938666735 |
21 | 378324531180 |
[1,22,252,2002,12396,63734,283107,1116236,3983485, 13057330,39764011,113533312,306173263,784654154, 1920802566,4510960122,10201294213,22286443124, 47167714715,96947735390,193938666735,378324531180] |