n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 48 |
4 | 165 |
5 | 572 |
6 | 2002 |
7 | 7071 |
8 | 25176 |
9 | 90251 |
10 | 325358 |
11 | 1178291 |
12 | 4282811 |
13 | 15612092 |
14 | 57040186 |
15 | 208772476 |
16 | 765186422 |
17 | 2807556411 |
18 | 10309833845 |
19 | 37883902913 |
20 | 139275229088 |
21 | 512223805060 |
22 | 1884404481767 |
23 | 6934058102453 |
24 | 25519786076294 |
[1,4,14,48,165,572,2002,7071,25176,90251,325358, 1178291,4282811,15612092,57040186,208772476, 765186422,2807556411,10309833845,37883902913, 139275229088,512223805060,1884404481767, 6934058102453,25519786076294] |