n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 20 |
4 | 57 |
5 | 157 |
6 | 432 |
7 | 1189 |
8 | 3270 |
9 | 8994 |
10 | 24735 |
11 | 68023 |
12 | 187064 |
13 | 514428 |
14 | 1414678 |
15 | 3890365 |
16 | 10698505 |
17 | 29420889 |
18 | 80907445 |
19 | 222495474 |
20 | 611862556 |
21 | 1682622029 |
22 | 4627210579 |
23 | 12724829094 |
24 | 34993280009 |
25 | 96231520027 |
26 | 264636680074 |
[1,2,7,20,57,157,432,1189,3270,8994,24735,68023, 187064,514428,1414678,3890365,10698505,29420889, 80907445,222495474,611862556,1682622029, 4627210579,12724829094,34993280009,96231520027, 264636680074] |