n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 22 |
4 | 132 |
5 | 875 |
6 | 6127 |
7 | 44580 |
8 | 333748 |
9 | 2553956 |
10 | 19887080 |
11 | 157066758 |
12 | 1255181598 |
13 | 10130663492 |
14 | 82461801961 |
15 | 676165571433 |
16 | 5580011570160 |
17 | 46309238031602 |
18 | 386256008451734 |
19 | 3236134144224075 |
20 | 27222318068596831 |
21 | 229828039356161276 |
22 | 1946773238298955438 |
[1,1,4,22,132,875,6127,44580,333748,2553956, 19887080,157066758,1255181598,10130663492, 82461801961,676165571433,5580011570160, 46309238031602,386256008451734,3236134144224075, 27222318068596831,229828039356161276, 1946773238298955438] |