n | a(n) |
---|---|
0 | 4 |
1 | 19 |
2 | 109 |
3 | 649 |
4 | 3889 |
5 | 23329 |
6 | 139969 |
7 | 839809 |
8 | 5038849 |
9 | 30233089 |
10 | 181398529 |
11 | 1088391169 |
12 | 6530347009 |
13 | 39182082049 |
14 | 235092492289 |
15 | 1410554953729 |
16 | 8463329722369 |
17 | 50779978334209 |
18 | 304679870005249 |
19 | 1828079220031489 |
20 | 10968475320188929 |
[4,19,109,649,3889,23329,139969,839809,5038849, 30233089,181398529,1088391169,6530347009, 39182082049,235092492289,1410554953729, 8463329722369,50779978334209,304679870005249, 1828079220031489,10968475320188929] |