n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 26 |
6 | 76 |
7 | 231 |
8 | 756 |
9 | 2556 |
10 | 9096 |
11 | 33231 |
12 | 126060 |
13 | 488488 |
14 | 1948232 |
15 | 7907185 |
16 | 32831370 |
17 | 138321690 |
18 | 593610420 |
19 | 2579109780 |
20 | 11377862340 |
21 | 50726936820 |
22 | 229078351992 |
23 | 1043999256966 |
24 | 4810194384348 |
25 | 22340617618860 |
26 | 104742353862360 |
27 | 494547143860035 |
[1,1,2,4,10,26,76,231,756,2556,9096,33231,126060, 488488,1948232,7907185,32831370,138321690, 593610420,2579109780,11377862340,50726936820, 229078351992,1043999256966,4810194384348, 22340617618860,104742353862360,494547143860035] |