n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 5 |
4 | 9 |
5 | 49 |
6 | 259 |
7 | 1736 |
8 | 13408 |
9 | 117664 |
10 | 1153714 |
11 | 12492569 |
12 | 147987413 |
13 | 1903194061 |
14 | 26402007855 |
15 | 392928613560 |
16 | 6244069139240 |
17 | 105515436903720 |
18 | 1889249822655882 |
19 | 35726927316484053 |
20 | 711526052649064073 |
[0,2,5,9,49,259,1736,13408,117664,1153714, 12492569,147987413,1903194061,26402007855, 392928613560,6244069139240,105515436903720, 1889249822655882,35726927316484053, 711526052649064073] |