n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 31 |
4 | 156 |
5 | 785 |
6 | 3978 |
7 | 20335 |
8 | 104856 |
9 | 545073 |
10 | 2854350 |
11 | 15046383 |
12 | 79787700 |
13 | 425360481 |
14 | 2278586898 |
15 | 12259138975 |
16 | 66216193968 |
17 | 358941938849 |
18 | 1952111592342 |
19 | 10648449309823 |
20 | 58245727453260 |
21 | 319406931168241 |
22 | 1755674399021466 |
23 | 9671384910586511 |
[0,1,6,31,156,785,3978,20335,104856,545073, 2854350,15046383,79787700,425360481,2278586898, 12259138975,66216193968,358941938849, 1952111592342,10648449309823,58245727453260, 319406931168241,1755674399021466,9671384910586511] |