n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 8 |
5 | 18 |
6 | 54 |
7 | 155 |
8 | 500 |
9 | 1614 |
10 | 5456 |
11 | 18630 |
12 | 64960 |
13 | 228740 |
14 | 814914 |
15 | 2926323 |
16 | 10589916 |
17 | 38561814 |
18 | 141219432 |
19 | 519711666 |
20 | 1921142832 |
21 | 7129756188 |
22 | 26555149404 |
23 | 99228108222 |
24 | 371886574632 |
25 | 1397548389644 |
26 | 5265131346368 |
[1,1,2,3,8,18,54,155,500,1614,5456,18630,64960, 228740,814914,2926323,10589916,38561814,141219432, 519711666,1921142832,7129756188,26555149404, 99228108222,371886574632,1397548389644, 5265131346368] |