n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 31 |
6 | 113 |
7 | 431 |
8 | 1697 |
9 | 6847 |
10 | 28161 |
11 | 117631 |
12 | 497665 |
13 | 2128127 |
14 | 9183489 |
15 | 39940863 |
16 | 174897665 |
17 | 770452479 |
18 | 3411959809 |
19 | 15181264895 |
20 | 67833868289 |
21 | 304256253951 |
22 | 1369404661761 |
23 | 6182858317823 |
24 | 27995941060609 |
25 | 127100310290431 |
26 | 578433619525633 |
27 | 2638370120138751 |
[0,1,1,3,9,31,113,431,1697,6847,28161,117631, 497665,2128127,9183489,39940863,174897665, 770452479,3411959809,15181264895,67833868289, 304256253951,1369404661761,6182858317823, 27995941060609,127100310290431,578433619525633, 2638370120138751] |