n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 10 |
3 | 56 |
4 | 346 |
5 | 2252 |
6 | 15184 |
7 | 104960 |
8 | 739162 |
9 | 5280932 |
10 | 38165260 |
11 | 278415920 |
12 | 2046924400 |
13 | 15148345760 |
14 | 112738423360 |
15 | 843126957056 |
16 | 6332299624282 |
17 | 47737325577620 |
18 | 361077477684436 |
19 | 2739270870994736 |
20 | 20836827035351596 |
21 | 158883473753259752 |
22 | 1214171997616258240 |
[1,2,10,56,346,2252,15184,104960,739162,5280932, 38165260,278415920,2046924400,15148345760, 112738423360,843126957056,6332299624282, 47737325577620,361077477684436,2739270870994736, 20836827035351596,158883473753259752, 1214171997616258240] |