n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 10 |
6 | 26 |
7 | 74 |
8 | 219 |
9 | 678 |
10 | 2160 |
11 | 7062 |
12 | 23538 |
13 | 79734 |
14 | 273600 |
15 | 948972 |
16 | 3320845 |
17 | 11708586 |
18 | 41546434 |
19 | 148236556 |
20 | 531446460 |
21 | 1913357426 |
22 | 6914471176 |
23 | 25071324984 |
24 | 91181690872 |
25 | 332528253078 |
26 | 1215726924628 |
27 | 4454924130364 |
[1,1,2,4,10,26,74,219,678,2160,7062,23538,79734, 273600,948972,3320845,11708586,41546434,148236556, 531446460,1913357426,6914471176,25071324984, 91181690872,332528253078,1215726924628, 4454924130364] |