n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 3 |
3 | 6 |
4 | 17 |
5 | 54 |
6 | 153 |
7 | 552 |
8 | 2057 |
9 | 8394 |
10 | 35539 |
11 | 166926 |
12 | 856189 |
13 | 4674890 |
14 | 27358553 |
15 | 171129072 |
16 | 1141190303 |
17 | 8017021932 |
18 | 59365844491 |
19 | 461939618824 |
[1,2,3,6,17,54,153,552,2057,8394,35539,166926, 856189,4674890,27358553,171129072,1141190303, 8017021932,59365844491,461939618824] |