n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 7 |
3 | 21 |
4 | 45 |
5 | 135 |
6 | 291 |
7 | 873 |
8 | 1881 |
9 | 5643 |
10 | 12159 |
11 | 36477 |
12 | 78597 |
13 | 235791 |
14 | 508059 |
15 | 1524177 |
16 | 3284145 |
17 | 9852435 |
18 | 21229047 |
19 | 63687141 |
20 | 137226717 |
21 | 411680151 |
22 | 887047443 |
23 | 2661142329 |
24 | 5733964809 |
25 | 17201894427 |
26 | 37064931183 |
27 | 111194793549 |
28 | 239591481525 |
29 | 718774444575 |
[1,3,7,21,45,135,291,873,1881,5643,12159,36477, 78597,235791,508059,1524177,3284145,9852435, 21229047,63687141,137226717,411680151,887047443, 2661142329,5733964809,17201894427,37064931183, 111194793549,239591481525,718774444575] |