n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 8 |
3 | 21 |
4 | 60 |
5 | 197 |
6 | 756 |
7 | 3367 |
8 | 17136 |
9 | 98153 |
10 | 624804 |
11 | 4375283 |
12 | 33424512 |
13 | 276622829 |
14 | 2465449252 |
15 | 23543304919 |
16 | 239810132288 |
17 | 2595353815825 |
18 | 29740563986500 |
19 | 359735190398875 |
20 | 4580290700420064 |
21 | 61233976084442741 |
[1,3,8,21,60,197,756,3367,17136,98153,624804, 4375283,33424512,276622829,2465449252,23543304919, 239810132288,2595353815825,29740563986500, 359735190398875,4580290700420064, 61233976084442741] |