n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 21 |
3 | 99 |
4 | 471 |
5 | 1935 |
6 | 8031 |
7 | 32319 |
8 | 130431 |
9 | 522495 |
10 | 2094591 |
11 | 8381439 |
12 | 33544191 |
13 | 134189055 |
14 | 536829951 |
15 | 2147368959 |
16 | 8589770751 |
17 | 34359279615 |
18 | 137438298111 |
19 | 549753978879 |
20 | 2199020634111 |
21 | 8796085682175 |
22 | 35184361603071 |
23 | 140737458995199 |
24 | 562949911478271 |
[1,0,21,99,471,1935,8031,32319,130431,522495, 2094591,8381439,33544191,134189055,536829951, 2147368959,8589770751,34359279615,137438298111, 549753978879,2199020634111,8796085682175, 35184361603071,140737458995199,562949911478271] |