n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 19 |
3 | 106 |
4 | 685 |
5 | 5056 |
6 | 42079 |
7 | 390454 |
8 | 4000441 |
9 | 44881660 |
10 | 547457611 |
11 | 7215589954 |
12 | 102211815589 |
13 | 1548801969976 |
14 | 25000879886935 |
15 | 428332610385166 |
16 | 7763306399014129 |
17 | 148412806214119924 |
18 | 2984692721713278211 |
[1,4,19,106,685,5056,42079,390454,4000441, 44881660,547457611,7215589954,102211815589, 1548801969976,25000879886935,428332610385166, 7763306399014129,148412806214119924, 2984692721713278211] |