n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 22 |
5 | 90 |
6 | 422 |
7 | 2226 |
8 | 13102 |
9 | 85170 |
10 | 606542 |
11 | 4697946 |
12 | 39330982 |
13 | 353985450 |
14 | 3408792662 |
15 | 34975509666 |
16 | 380947661662 |
17 | 4390028664930 |
18 | 53368010874782 |
19 | 682564606249386 |
20 | 9162253729773142 |
21 | 128794752680027610 |
22 | 1892150024227428902 |
23 | 28998220554100469106 |
[1,1,2,6,22,90,422,2226,13102,85170,606542, 4697946,39330982,353985450,3408792662,34975509666, 380947661662,4390028664930,53368010874782, 682564606249386,9162253729773142, 128794752680027610,1892150024227428902, 28998220554100469106] |