n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 3 |
5 | 6 |
6 | 16 |
7 | 42 |
8 | 151 |
9 | 596 |
10 | 2605 |
11 | 12098 |
12 | 59166 |
13 | 297684 |
14 | 1538590 |
15 | 8109078 |
16 | 43476751 |
17 | 236474942 |
18 | 1302680941 |
19 | 7256842362 |
20 | 40832979283 |
21 | 231838418310 |
22 | 1327095781740 |
23 | 7653155567834 |
24 | 44434752082990 |
25 | 259600430870176 |
26 | 1525366978752096 |
27 | 9010312253993072 |
28 | 53485145730576790 |
[1,2,3,6,16,42,151,596,2605,12098,59166,297684, 1538590,8109078,43476751,236474942,1302680941, 7256842362,40832979283,231838418310,1327095781740, 7653155567834,44434752082990,259600430870176, 1525366978752096,9010312253993072, 53485145730576790] |