n | a(n) |
---|---|
0 | 3 |
1 | 15 |
2 | 73 |
3 | 361 |
4 | 1806 |
5 | 9122 |
6 | 46425 |
7 | 237721 |
8 | 1223365 |
9 | 6321965 |
10 | 32784830 |
11 | 170528190 |
12 | 889291352 |
13 | 4648068192 |
14 | 24342384337 |
15 | 127707864849 |
16 | 671047979300 |
17 | 3531026714720 |
18 | 18603737992455 |
19 | 98129545962855 |
20 | 518149580437560 |
[3,15,73,361,1806,9122,46425,237721,1223365, 6321965,32784830,170528190,889291352,4648068192, 24342384337,127707864849,671047979300, 3531026714720,18603737992455,98129545962855, 518149580437560] |