n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 16 |
4 | 45 |
5 | 121 |
6 | 338 |
7 | 929 |
8 | 2598 |
9 | 7261 |
10 | 20453 |
11 | 57738 |
12 | 163799 |
13 | 465778 |
14 | 1328697 |
15 | 3798473 |
16 | 10883314 |
17 | 31237935 |
18 | 89812975 |
19 | 258595806 |
20 | 745563123 |
21 | 2152093734 |
22 | 6218854285 |
23 | 17988163439 |
24 | 52078267380 |
25 | 150899028305 |
26 | 437571778542 |
27 | 1269754686051 |
28 | 3687025215421 |
[1,2,6,16,45,121,338,929,2598,7261,20453,57738, 163799,465778,1328697,3798473,10883314,31237935, 89812975,258595806,745563123,2152093734, 6218854285,17988163439,52078267380,150899028305, 437571778542,1269754686051,3687025215421] |