n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 876 |
8 | 4120 |
9 | 20883 |
10 | 113034 |
11 | 648410 |
12 | 3917021 |
13 | 24785452 |
14 | 163525976 |
15 | 1120523114 |
16 | 7947399981 |
17 | 58172358642 |
18 | 438300848329 |
19 | 3391585460591 |
20 | 26898763482122 |
[1,1,2,5,15,52,203,876,4120,20883,113034,648410, 3917021,24785452,163525976,1120523114,7947399981, 58172358642,438300848329,3391585460591, 26898763482122] |