n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 2 |
5 | 6 |
6 | 20 |
7 | 51 |
8 | 141 |
9 | 381 |
10 | 1001 |
11 | 2796 |
12 | 7861 |
13 | 22306 |
14 | 64129 |
15 | 185692 |
16 | 540468 |
17 | 1585246 |
18 | 4674464 |
19 | 13846636 |
20 | 41216933 |
21 | 123176849 |
22 | 369410571 |
23 | 1111661833 |
24 | 3355466306 |
25 | 10156304314 |
26 | 30821794651 |
27 | 93761053797 |
28 | 285859742756 |
29 | 873355481467 |
30 | 2673455511946 |
31 | 8198687383812 |
[1,1,1,2,2,6,20,51,141,381,1001,2796,7861,22306, 64129,185692,540468,1585246,4674464,13846636, 41216933,123176849,369410571,1111661833, 3355466306,10156304314,30821794651,93761053797, 285859742756,873355481467,2673455511946, 8198687383812] |