n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 16 |
5 | 56 |
6 | 190 |
7 | 624 |
8 | 2014 |
9 | 6412 |
10 | 20219 |
11 | 63284 |
12 | 196938 |
13 | 610052 |
14 | 1882717 |
15 | 5792528 |
16 | 17776102 |
17 | 54433100 |
18 | 166374109 |
19 | 507710420 |
20 | 1547195902 |
21 | 4709218604 |
22 | 14318240578 |
23 | 43493134160 |
24 | 132003957436 |
25 | 400337992056 |
26 | 1213314272395 |
27 | 3674980475284 |
28 | 11124919273160 |
[0,1,4,16,56,190,624,2014,6412,20219,63284,196938, 610052,1882717,5792528,17776102,54433100, 166374109,507710420,1547195902,4709218604, 14318240578,43493134160,132003957436,400337992056, 1213314272395,3674980475284,11124919273160] |