n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 15 |
4 | 62 |
5 | 271 |
6 | 1247 |
7 | 5938 |
8 | 29113 |
9 | 145815 |
10 | 743384 |
11 | 3844314 |
12 | 20118681 |
13 | 106348391 |
14 | 567002169 |
15 | 3045455865 |
16 | 16463622763 |
17 | 89509216860 |
18 | 489103356753 |
19 | 2684663659765 |
20 | 14795752770278 |
21 | 81841297482116 |
22 | 454202999050433 |
23 | 2528381760697852 |
[1,1,4,15,62,271,1247,5938,29113,145815,743384, 3844314,20118681,106348391,567002169,3045455865, 16463622763,89509216860,489103356753, 2684663659765,14795752770278,81841297482116, 454202999050433,2528381760697852] |