n | a(n) |
---|---|
0 | 4 |
1 | 18 |
2 | 70 |
3 | 270 |
4 | 1054 |
5 | 4158 |
6 | 16510 |
7 | 65790 |
8 | 262654 |
9 | 1049598 |
10 | 4196350 |
11 | 16781310 |
12 | 67117054 |
13 | 268451838 |
14 | 1073774590 |
15 | 4295032830 |
16 | 17180000254 |
17 | 68719738878 |
18 | 274878431230 |
19 | 1099512676350 |
20 | 4398048608254 |
21 | 17592190238718 |
22 | 70368752566270 |
23 | 281474993487870 |
24 | 1125899940397054 |
[4,18,70,270,1054,4158,16510,65790,262654,1049598, 4196350,16781310,67117054,268451838,1073774590, 4295032830,17180000254,68719738878,274878431230, 1099512676350,4398048608254,17592190238718, 70368752566270,281474993487870,1125899940397054] |