n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 15 |
3 | 57 |
4 | 195 |
5 | 633 |
6 | 1995 |
7 | 6177 |
8 | 18915 |
9 | 57513 |
10 | 174075 |
11 | 525297 |
12 | 1582035 |
13 | 4758393 |
14 | 14299755 |
15 | 42948417 |
16 | 128943555 |
17 | 387027273 |
18 | 1161475035 |
19 | 3485211537 |
20 | 10457207475 |
21 | 31374768153 |
22 | 94130595915 |
23 | 282404370657 |
24 | 847238277795 |
25 | 2541765165033 |
26 | 7625396158395 |
27 | 22876389801777 |
28 | 68629572058515 |
[0,3,15,57,195,633,1995,6177,18915,57513,174075, 525297,1582035,4758393,14299755,42948417, 128943555,387027273,1161475035,3485211537, 10457207475,31374768153,94130595915,282404370657, 847238277795,2541765165033,7625396158395, 22876389801777,68629572058515] |