n | a(n) |
---|---|
0 | 3 |
1 | 9 |
2 | 28 |
3 | 84 |
4 | 246 |
5 | 707 |
6 | 2001 |
7 | 5592 |
8 | 15461 |
9 | 42357 |
10 | 115122 |
11 | 310716 |
12 | 833472 |
13 | 2223471 |
14 | 5902415 |
15 | 15598896 |
16 | 41058423 |
17 | 107673601 |
18 | 281416248 |
19 | 733229412 |
20 | 1904957434 |
21 | 4936026747 |
22 | 12758472189 |
23 | 32901998472 |
24 | 84667043769 |
25 | 217437602349 |
26 | 557361593902 |
27 | 1426167813324 |
[3,9,28,84,246,707,2001,5592,15461,42357,115122, 310716,833472,2223471,5902415,15598896,41058423, 107673601,281416248,733229412,1904957434, 4936026747,12758472189,32901998472,84667043769, 217437602349,557361593902,1426167813324] |