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2?????=4??1?????

3?????=16??1?????

4?????=64??1?????

5?????=256??1?????

6?????=1024??1?????

7?????=4096??1?????

8?????=16384??1?????

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???磺4????5?????????????2??4??1??3??????????????????????????????256-64-64-16=112??1?????????5??

1???????2??+3??1?????

2???????3??+12??1?????

3???????4??+48??1?????

4???????5??+192??1?????

5???????6??+768??1?????

6???????7??+3072??1?????

7???????8??+12288??1?????

8???????9??+49152??1?????

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