n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 12 |
4 | 36 |
5 | 90 |
6 | 286 |
7 | 728 |
8 | 2380 |
9 | 6120 |
10 | 20349 |
11 | 52668 |
12 | 177100 |
13 | 460460 |
14 | 1560780 |
15 | 4071600 |
16 | 13884156 |
17 | 36312408 |
18 | 124403620 |
19 | 326023280 |
20 | 1121099408 |
21 | 2942885946 |
22 | 10150595910 |
23 | 26681566392 |
24 | 92263734836 |
25 | 242799302200 |
26 | 841392966470 |
27 | 2216352204360 |
28 | 7694644696200 |
[1,2,5,12,36,90,286,728,2380,6120,20349,52668, 177100,460460,1560780,4071600,13884156,36312408, 124403620,326023280,1121099408,2942885946, 10150595910,26681566392,92263734836,242799302200, 841392966470,2216352204360,7694644696200] |