n | a(n) |
---|---|
1 | 2 |
2 | 7 |
3 | 26 |
4 | 86 |
5 | 291 |
6 | 980 |
7 | 3309 |
8 | 11161 |
9 | 37656 |
10 | 127036 |
11 | 428581 |
12 | 1445887 |
13 | 4877950 |
14 | 16456589 |
15 | 55519107 |
16 | 187303144 |
17 | 631899019 |
18 | 2131818803 |
19 | 7192053308 |
20 | 24263615009 |
21 | 81857431864 |
22 | 276159968238 |
23 | 931672620616 |
24 | 3143156039330 |
25 | 10603971469191 |
[2,7,26,86,291,980,3309,11161,37656,127036,428581, 1445887,4877950,16456589,55519107,187303144, 631899019,2131818803,7192053308,24263615009, 81857431864,276159968238,931672620616, 3143156039330,10603971469191] |