n | a(n) |
---|---|
1 | 3 |
2 | 4 |
3 | 9 |
4 | 20 |
5 | 48 |
6 | 121 |
7 | 312 |
8 | 820 |
9 | 2187 |
10 | 5904 |
11 | 16104 |
12 | 44286 |
13 | 122640 |
14 | 341640 |
15 | 956593 |
16 | 2690420 |
17 | 7596480 |
18 | 21523360 |
19 | 61171656 |
20 | 174339220 |
21 | 498112057 |
22 | 1426411800 |
23 | 4093181688 |
24 | 11767897353 |
25 | 33891544377 |
26 | 97764070320 |
27 | 282429536481 |
[3,4,9,20,48,121,312,820,2187,5904,16104,44286, 122640,341640,956593,2690420,7596480,21523360, 61171656,174339220,498112057,1426411800, 4093181688,11767897353,33891544377,97764070320, 282429536481] |