n | a(n) |
---|---|
0 | 3 |
1 | 6 |
2 | 15 |
3 | 42 |
4 | 123 |
5 | 366 |
6 | 1095 |
7 | 3282 |
8 | 9843 |
9 | 29526 |
10 | 88575 |
11 | 265722 |
12 | 797163 |
13 | 2391486 |
14 | 7174455 |
15 | 21523362 |
16 | 64570083 |
17 | 193710246 |
18 | 581130735 |
19 | 1743392202 |
20 | 5230176603 |
21 | 15690529806 |
22 | 47071589415 |
23 | 141214768242 |
24 | 423644304723 |
25 | 1270932914166 |
[3,6,15,42,123,366,1095,3282,9843,29526,88575, 265722,797163,2391486,7174455,21523362,64570083, 193710246,581130735,1743392202,5230176603, 15690529806,47071589415,141214768242,423644304723, 1270932914166] |