n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 26 |
6 | 144 |
7 | 800 |
8 | 4995 |
9 | 32176 |
10 | 215914 |
11 | 1486270 |
12 | 10471534 |
13 | 75137664 |
14 | 547756650 |
15 | 4047212142 |
16 | 30255934851 |
17 | 228513227318 |
18 | 1741572167716 |
19 | 13380306774014 |
20 | 103542814440878 |
21 | 806476983310180 |
22 | 6318519422577854 |
23 | 49769050291536486 |
24 | 393933908000862866 |
[1,1,1,2,7,26,144,800,4995,32176,215914,1486270, 10471534,75137664,547756650,4047212142, 30255934851,228513227318,1741572167716, 13380306774014,103542814440878,806476983310180, 6318519422577854,49769050291536486, 393933908000862866] |