n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 21 |
5 | 51 |
6 | 126 |
7 | 351 |
8 | 981 |
9 | 2646 |
10 | 7101 |
11 | 19251 |
12 | 52326 |
13 | 141831 |
14 | 384021 |
15 | 1040526 |
16 | 2820501 |
17 | 7644051 |
18 | 20713806 |
19 | 56132271 |
20 | 152119701 |
21 | 412245126 |
22 | 1117169901 |
23 | 3027492531 |
24 | 8204438646 |
25 | 22233857751 |
26 | 60253212501 |
27 | 163284696126 |
[1,1,1,6,21,51,126,351,981,2646,7101,19251,52326, 141831,384021,1040526,2820501,7644051,20713806, 56132271,152119701,412245126,1117169901, 3027492531,8204438646,22233857751,60253212501, 163284696126] |