n | a(n) |
---|---|
6 | 1 |
7 | 4 |
8 | 17 |
9 | 60 |
10 | 209 |
11 | 685 |
12 | 2204 |
13 | 6913 |
14 | 21387 |
15 | 65241 |
16 | 197104 |
17 | 590284 |
18 | 1755804 |
19 | 5191723 |
20 | 15276610 |
21 | 44761350 |
22 | 130682371 |
23 | 380337474 |
24 | 1103927291 |
25 | 3196494453 |
[1,4,17,60,209,685,2204,6913,21387,65241,197104, 590284,1755804,5191723,15276610,44761350, 130682371,380337474,1103927291,3196494453] |