n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 20 |
5 | 54 |
6 | 164 |
7 | 500 |
8 | 1630 |
9 | 5472 |
10 | 19256 |
11 | 70121 |
12 | 265723 |
13 | 1041184 |
14 | 4225484 |
15 | 17689505 |
16 | 76392933 |
17 | 339283021 |
18 | 1548592471 |
19 | 7246210567 |
20 | 34725853445 |
21 | 170096822940 |
22 | 850715642495 |
23 | 4337263437693 |
24 | 22519434992230 |
25 | 118916581795167 |
26 | 638088881489144 |
27 | 3475474084479428 |
[1,1,3,7,20,54,164,500,1630,5472,19256,70121, 265723,1041184,4225484,17689505,76392933, 339283021,1548592471,7246210567,34725853445, 170096822940,850715642495,4337263437693, 22519434992230,118916581795167,638088881489144, 3475474084479428] |