n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 6 |
4 | 15 |
5 | 36 |
6 | 99 |
7 | 270 |
8 | 783 |
9 | 2298 |
10 | 6936 |
11 | 21204 |
12 | 65895 |
13 | 206862 |
14 | 656253 |
15 | 2098602 |
16 | 6761028 |
17 | 21917364 |
18 | 71450229 |
19 | 234070806 |
20 | 770216253 |
21 | 2544458592 |
22 | 8435990916 |
23 | 28060099692 |
24 | 93612265143 |
25 | 313153860210 |
26 | 1050194570445 |
27 | 3530080085868 |
[0,1,3,6,15,36,99,270,783,2298,6936,21204,65895, 206862,656253,2098602,6761028,21917364,71450229, 234070806,770216253,2544458592,8435990916, 28060099692,93612265143,313153860210, 1050194570445,3530080085868] |