n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 17 |
4 | 58 |
5 | 215 |
6 | 866 |
7 | 3507 |
8 | 14120 |
9 | 56921 |
10 | 229860 |
11 | 928443 |
12 | 3749720 |
13 | 15144167 |
14 | 61165438 |
15 | 247041429 |
16 | 997775144 |
17 | 4029911351 |
18 | 16276407572 |
19 | 65738788527 |
20 | 265512410122 |
21 | 1072378133103 |
22 | 4331228325504 |
23 | 17493399301365 |
24 | 70654095337584 |
[1,4,17,58,215,866,3507,14120,56921,229860,928443, 3749720,15144167,61165438,247041429,997775144, 4029911351,16276407572,65738788527,265512410122, 1072378133103,4331228325504,17493399301365, 70654095337584] |