n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 20 |
4 | 49 |
5 | 115 |
6 | 343 |
7 | 850 |
8 | 2401 |
9 | 6698 |
10 | 18677 |
11 | 52383 |
12 | 148417 |
13 | 418280 |
14 | 1184717 |
15 | 3357537 |
16 | 9518235 |
17 | 27001128 |
18 | 76637532 |
19 | 217530615 |
20 | 617624137 |
21 | 1753811531 |
22 | 4980521844 |
23 | 14144892243 |
24 | 40174244540 |
25 | 114105904403 |
26 | 324101321331 |
27 | 920579535645 |
28 | 2614852152957 |
[1,3,9,20,49,115,343,850,2401,6698,18677,52383, 148417,418280,1184717,3357537,9518235,27001128, 76637532,217530615,617624137,1753811531, 4980521844,14144892243,40174244540,114105904403, 324101321331,920579535645,2614852152957] |