n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 7 |
5 | 27 |
6 | 110 |
7 | 460 |
8 | 1948 |
9 | 8296 |
10 | 35400 |
11 | 151056 |
12 | 643892 |
13 | 2740216 |
14 | 11639416 |
15 | 49340080 |
16 | 208727176 |
17 | 881212272 |
18 | 3713043152 |
19 | 15615663008 |
20 | 65555425780 |
21 | 274734294328 |
22 | 1149506252376 |
23 | 4802212126704 |
24 | 20032666552664 |
25 | 83452195924304 |
26 | 347192769717040 |
27 | 1442672957396320 |
[1,2,7,27,110,460,1948,8296,35400,151056,643892, 2740216,11639416,49340080,208727176,881212272, 3713043152,15615663008,65555425780,274734294328, 1149506252376,4802212126704,20032666552664, 83452195924304,347192769717040,1442672957396320] |