n | a(n) |
---|---|
1 | 4 |
2 | 26 |
3 | 56 |
4 | 90 |
5 | 122 |
6 | 568 |
7 | 2042 |
8 | 8186 |
9 | 32762 |
10 | 37432 |
11 | 68652 |
12 | 299576 |
13 | 2097146 |
14 | 8388602 |
15 | 19173944 |
16 | 33554426 |
17 | 67751984 |
18 | 78536544824 |
19 | 306296525088 |
20 | 15640174780344 |
21 | 39998905951528 |
22 | 120948840863188 |
[4,26,56,90,122,568,2042,8186,32762,37432,68652, 299576,2097146,8388602,19173944,33554426,67751984, 78536544824,306296525088,15640174780344, 39998905951528,120948840863188] |