n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 30 |
4 | 141 |
5 | 704 |
6 | 3666 |
7 | 19686 |
8 | 108222 |
9 | 606062 |
10 | 3445308 |
11 | 19829680 |
12 | 115323955 |
13 | 676659960 |
14 | 4000719012 |
15 | 23811922678 |
16 | 142557391306 |
17 | 857894530348 |
18 | 5186614665121 |
19 | 31487226410770 |
20 | 191871141682557 |
21 | 1173163962971056 |
22 | 7195329233469552 |
23 | 44255915928488880 |
[1,2,7,30,141,704,3666,19686,108222,606062, 3445308,19829680,115323955,676659960,4000719012, 23811922678,142557391306,857894530348, 5186614665121,31487226410770,191871141682557, 1173163962971056,7195329233469552, 44255915928488880] |