n | a(n) |
---|---|
1 | 2 |
2 | 5 |
3 | 15 |
4 | 61 |
5 | 309 |
6 | 1856 |
7 | 12997 |
8 | 103981 |
9 | 935836 |
10 | 9358363 |
11 | 102941998 |
12 | 1235303982 |
13 | 16058951777 |
14 | 224825324882 |
15 | 3372379873234 |
16 | 53958077971757 |
17 | 917287325519884 |
18 | 16511171859357918 |
19 | 313712265327800453 |
20 | 6274245306556009077 |
[2,5,15,61,309,1856,12997,103981,935836,9358363, 102941998,1235303982,16058951777,224825324882, 3372379873234,53958077971757,917287325519884, 16511171859357918,313712265327800453, 6274245306556009077] |