n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 10 |
3 | 40 |
4 | 172 |
5 | 752 |
6 | 3417 |
7 | 15861 |
8 | 74103 |
9 | 351352 |
10 | 1681640 |
11 | 8076015 |
12 | 39063800 |
13 | 189889216 |
14 | 924922052 |
15 | 4523125805 |
16 | 22183456842 |
17 | 108940260148 |
18 | 536282913395 |
19 | 2644780657087 |
20 | 13054897004324 |
21 | 64540176018987 |
22 | 319455186011981 |
23 | 1582213202208502 |
24 | 7844634619098689 |
25 | 38926073651463768 |
26 | 193245536619581965 |
[1,3,10,40,172,752,3417,15861,74103,351352, 1681640,8076015,39063800,189889216,924922052, 4523125805,22183456842,108940260148,536282913395, 2644780657087,13054897004324,64540176018987, 319455186011981,1582213202208502,7844634619098689, 38926073651463768,193245536619581965] |