n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 20 |
3 | 72 |
4 | 280 |
5 | 1040 |
6 | 4200 |
7 | 16408 |
8 | 65840 |
9 | 262296 |
10 | 1049680 |
11 | 4194344 |
12 | 16782000 |
13 | 67108912 |
14 | 268451960 |
15 | 1073744160 |
16 | 4295033440 |
17 | 17179869248 |
18 | 68719747320 |
19 | 274877907016 |
20 | 1099512679520 |
21 | 4398046544304 |
22 | 17592190238920 |
23 | 70368744177752 |
[0,4,20,72,280,1040,4200,16408,65840,262296, 1049680,4194344,16782000,67108912,268451960, 1073744160,4295033440,17179869248,68719747320, 274877907016,1099512679520,4398046544304, 17592190238920,70368744177752] |