n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 21 |
3 | 127 |
4 | 831 |
5 | 5722 |
6 | 40879 |
7 | 300440 |
8 | 2258455 |
9 | 17291704 |
10 | 134417955 |
11 | 1058279251 |
12 | 8422155293 |
13 | 67647554826 |
14 | 547699155261 |
15 | 4465275681735 |
16 | 36627214297455 |
17 | 302067234113560 |
18 | 2503174651819435 |
19 | 20832888975309257 |
20 | 174057811108059017 |
21 | 1459365504991034106 |
[1,4,21,127,831,5722,40879,300440,2258455, 17291704,134417955,1058279251,8422155293, 67647554826,547699155261,4465275681735, 36627214297455,302067234113560,2503174651819435, 20832888975309257,174057811108059017, 1459365504991034106] |