n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 22 |
3 | 125 |
4 | 669 |
5 | 3410 |
6 | 16677 |
7 | 78369 |
8 | 359110 |
9 | 1612613 |
10 | 7133274 |
11 | 31185350 |
12 | 135062165 |
13 | 580556958 |
14 | 2480278767 |
15 | 10542976739 |
16 | 44626102826 |
17 | 188215850830 |
18 | 791374442571 |
19 | 3318478309647 |
20 | 13882441625034 |
21 | 57952990683107 |
[1,4,22,125,669,3410,16677,78369,359110,1612613, 7133274,31185350,135062165,580556958,2480278767, 10542976739,44626102826,188215850830,791374442571, 3318478309647,13882441625034,57952990683107] |