n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 4140 |
9 | 21146 |
10 | 115945 |
11 | 678012 |
12 | 4205209 |
13 | 27531954 |
14 | 189486817 |
15 | 1365888674 |
16 | 10278272450 |
17 | 80503198320 |
18 | 654544093035 |
19 | 5511256984436 |
20 | 47950929125540 |
[1,1,2,5,15,52,203,877,4140,21146,115945,678012, 4205209,27531954,189486817,1365888674,10278272450, 80503198320,654544093035,5511256984436, 47950929125540] |