n | a(n) |
---|---|
2 | 2 |
3 | 7 |
4 | 20 |
5 | 56 |
6 | 155 |
7 | 429 |
8 | 1188 |
9 | 3298 |
10 | 9181 |
11 | 25634 |
12 | 71781 |
13 | 201569 |
14 | 567538 |
15 | 1601971 |
16 | 4532460 |
17 | 12851882 |
18 | 36516613 |
19 | 103955432 |
20 | 296471643 |
21 | 846932919 |
22 | 2423256440 |
23 | 6943726380 |
24 | 19924638557 |
25 | 57247669927 |
26 | 164688166948 |
27 | 474323305547 |
[2,7,20,56,155,429,1188,3298,9181,25634,71781, 201569,567538,1601971,4532460,12851882,36516613, 103955432,296471643,846932919,2423256440, 6943726380,19924638557,57247669927,164688166948, 474323305547] |