n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 6 |
5 | 19 |
6 | 49 |
7 | 143 |
8 | 403 |
9 | 1235 |
10 | 3681 |
11 | 11354 |
12 | 34944 |
13 | 108956 |
14 | 340635 |
15 | 1072593 |
16 | 3388161 |
17 | 10751029 |
18 | 34217608 |
19 | 109255023 |
20 | 349750874 |
21 | 1122436127 |
22 | 3610017340 |
[1,1,4,6,19,49,143,403,1235,3681,11354,34944, 108956,340635,1072593,3388161,10751029,34217608, 109255023,349750874,1122436127,3610017340] |