n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 21 |
6 | 75 |
7 | 277 |
8 | 1083 |
9 | 4419 |
10 | 18493 |
11 | 77729 |
12 | 332557 |
13 | 1444477 |
14 | 6307225 |
15 | 27912147 |
16 | 123878207 |
17 | 554733045 |
18 | 2492087531 |
19 | 11280537097 |
20 | 51120499279 |
21 | 233319480419 |
22 | 1065835004917 |
23 | 4895443823281 |
24 | 22505853359485 |
25 | 103958158302085 |
26 | 480365303903637 |
27 | 2229412587062123 |
[1,1,3,7,21,75,277,1083,4419,18493,77729,332557, 1444477,6307225,27912147,123878207,554733045, 2492087531,11280537097,51120499279,233319480419, 1065835004917,4895443823281,22505853359485, 103958158302085,480365303903637,2229412587062123] |