n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 33 |
4 | 90 |
5 | 244 |
6 | 665 |
7 | 1808 |
8 | 4914 |
9 | 13359 |
10 | 36315 |
11 | 98715 |
12 | 268337 |
13 | 729416 |
14 | 1982759 |
15 | 5389698 |
16 | 14650719 |
17 | 39824784 |
18 | 108254987 |
19 | 294267566 |
20 | 799902177 |
21 | 2174359553 |
22 | 5910522063 |
23 | 16066464720 |
24 | 43673179097 |
25 | 118716009132 |
26 | 322703570371 |
[1,4,12,33,90,244,665,1808,4914,13359,36315,98715, 268337,729416,1982759,5389698,14650719,39824784, 108254987,294267566,799902177,2174359553, 5910522063,16066464720,43673179097,118716009132, 322703570371] |