n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 5 |
6 | 13 |
7 | 40 |
8 | 123 |
9 | 388 |
10 | 1284 |
11 | 4332 |
12 | 14868 |
13 | 51094 |
14 | 178361 |
15 | 634422 |
16 | 2260717 |
17 | 8066841 |
18 | 29030051 |
19 | 105247340 |
20 | 383574146 |
21 | 1404657053 |
22 | 5171018981 |
23 | 19140750300 |
24 | 71124341227 |
25 | 263546155710 |
26 | 983417309702 |
27 | 3684399940711 |
28 | 13818092760075 |
29 | 51937827473594 |
30 | 195956606402526 |
[0,0,1,1,5,13,40,123,388,1284,4332,14868,51094, 178361,634422,2260717,8066841,29030051,105247340, 383574146,1404657053,5171018981,19140750300, 71124341227,263546155710,983417309702, 3684399940711,13818092760075,51937827473594, 195956606402526] |