n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 13 |
4 | 45 |
5 | 160 |
6 | 565 |
7 | 2005 |
8 | 7108 |
9 | 25209 |
10 | 89401 |
11 | 317056 |
12 | 1124425 |
13 | 3987721 |
14 | 14142276 |
15 | 50154949 |
16 | 177872293 |
17 | 630816160 |
18 | 2237161405 |
19 | 7933993245 |
20 | 28137553540 |
21 | 99788579953 |
22 | 353895752689 |
23 | 1255075518976 |
24 | 4451069407761 |
25 | 15785519335825 |
[1,4,13,45,160,565,2005,7108,25209,89401,317056, 1124425,3987721,14142276,50154949,177872293, 630816160,2237161405,7933993245,28137553540, 99788579953,353895752689,1255075518976, 4451069407761,15785519335825] |