n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 25 |
5 | 75 |
6 | 223 |
7 | 665 |
8 | 1993 |
9 | 5971 |
10 | 17903 |
11 | 53697 |
12 | 161065 |
13 | 483163 |
14 | 1449439 |
15 | 4348233 |
16 | 13044585 |
17 | 39133571 |
18 | 117400431 |
19 | 352200881 |
20 | 1056601993 |
21 | 3169805003 |
22 | 9509413535 |
23 | 28528238329 |
24 | 85584711561 |
25 | 256754129459 |
26 | 770262380399 |
27 | 2310787129121 |
28 | 6932361368937 |
[0,1,3,9,25,75,223,665,1993,5971,17903,53697, 161065,483163,1449439,4348233,13044585,39133571, 117400431,352200881,1056601993,3169805003, 9509413535,28528238329,85584711561,256754129459, 770262380399,2310787129121,6932361368937] |