n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 60 |
4 | 260 |
5 | 1092 |
6 | 4641 |
7 | 19635 |
8 | 83215 |
9 | 352440 |
10 | 1493064 |
11 | 6324552 |
12 | 26791505 |
13 | 113490195 |
14 | 480752895 |
15 | 2036500788 |
16 | 8626757644 |
17 | 36543528780 |
18 | 154800876945 |
19 | 655747029795 |
20 | 2777789007071 |
21 | 11766903040368 |
22 | 49845401197200 |
23 | 211148507782800 |
24 | 894439432403425 |
[1,3,15,60,260,1092,4641,19635,83215,352440, 1493064,6324552,26791505,113490195,480752895, 2036500788,8626757644,36543528780,154800876945, 655747029795,2777789007071,11766903040368, 49845401197200,211148507782800,894439432403425] |