n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 9 |
5 | 26 |
6 | 76 |
7 | 246 |
8 | 809 |
9 | 2704 |
10 | 9226 |
11 | 32066 |
12 | 112716 |
13 | 400024 |
14 | 1432614 |
15 | 5170604 |
16 | 18784169 |
17 | 68635478 |
18 | 252085792 |
19 | 930138522 |
20 | 3446167834 |
21 | 12815663844 |
22 | 47820414962 |
23 | 178987624514 |
24 | 671825133644 |
25 | 2528212128776 |
26 | 9536894664376 |
[1,1,4,9,26,76,246,809,2704,9226,32066,112716, 400024,1432614,5170604,18784169,68635478, 252085792,930138522,3446167834,12815663844, 47820414962,178987624514,671825133644, 2528212128776,9536894664376] |