n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 12 |
3 | 33 |
4 | 96 |
5 | 255 |
6 | 780 |
7 | 2205 |
8 | 6672 |
9 | 19755 |
10 | 59340 |
11 | 177177 |
12 | 532416 |
13 | 1594359 |
14 | 4785228 |
15 | 14349525 |
16 | 43053504 |
17 | 129140211 |
18 | 387441756 |
19 | 1162261521 |
20 | 3486844320 |
21 | 10460357775 |
22 | 31381236876 |
23 | 94143178893 |
24 | 282430082832 |
25 | 847288610475 |
[0,3,12,33,96,255,780,2205,6672,19755,59340, 177177,532416,1594359,4785228,14349525,43053504, 129140211,387441756,1162261521,3486844320, 10460357775,31381236876,94143178893,282430082832, 847288610475] |