n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 15 |
6 | 46 |
7 | 132 |
8 | 432 |
9 | 1384 |
10 | 4735 |
11 | 16158 |
12 | 56766 |
13 | 200473 |
14 | 718012 |
15 | 2587000 |
16 | 9398080 |
17 | 34324173 |
18 | 126067124 |
19 | 465093570 |
20 | 1723171550 |
21 | 6407924165 |
22 | 23910560070 |
23 | 89494164972 |
24 | 335913861648 |
25 | 1264107416450 |
26 | 4768452532025 |
[1,1,1,2,6,15,46,132,432,1384,4735,16158,56766, 200473,718012,2587000,9398080,34324173,126067124, 465093570,1723171550,6407924165,23910560070, 89494164972,335913861648,1264107416450, 4768452532025] |