n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 20 |
4 | 89 |
5 | 198 |
6 | 881 |
7 | 1960 |
8 | 8721 |
9 | 19402 |
10 | 86329 |
11 | 192060 |
12 | 854569 |
13 | 1901198 |
14 | 8459361 |
15 | 18819920 |
16 | 83739041 |
17 | 186298002 |
18 | 828931049 |
19 | 1844160100 |
20 | 8205571449 |
21 | 18255302998 |
22 | 81226783441 |
23 | 180708869880 |
[1,2,9,20,89,198,881,1960,8721,19402,86329,192060, 854569,1901198,8459361,18819920,83739041, 186298002,828931049,1844160100,8205571449, 18255302998,81226783441,180708869880] |