n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 3 |
3 | 6 |
4 | 9 |
5 | 18 |
6 | 45 |
7 | 118 |
8 | 336 |
9 | 954 |
10 | 2695 |
11 | 7590 |
12 | 21321 |
13 | 59890 |
14 | 168273 |
15 | 473966 |
16 | 1337476 |
17 | 3785154 |
18 | 10738373 |
19 | 30546502 |
20 | 87099571 |
21 | 248937978 |
22 | 712995733 |
23 | 2046236598 |
24 | 5883318437 |
25 | 16944709370 |
26 | 48880145967 |
27 | 141211579446 |
[1,2,3,6,9,18,45,118,336,954,2695,7590,21321, 59890,168273,473966,1337476,3785154,10738373, 30546502,87099571,248937978,712995733,2046236598, 5883318437,16944709370,48880145967,141211579446] |