1,4,8,12....第5个数是多少，n个数是多少。
\u8bf7\u95ee\u6570\u52171\uff0c4\uff0c5\uff0c8\uff0c9\uff0c12......,\u7b2cn\u4e2a\u6570\u662f\u591a\u5c11\uff1f\u56e0\u4e3a\u5947\u6570\u4f4d\uff1a1 5 9 13 ...
\u5076\u6570\u4f4d\uff1a4 8 12 16 ...
\u6240\u4ee5\u82e5n\u4e3a\u5947\u6570\uff0c\u7b2cn\u4e2a\u6570\u4e3a2n-1
\u82e5n\u4e3a\u5076\u6570\uff0c\u7b2cn\u4e2a\u6570\u4e3a2n
2n/(n^2+1)
0、4,8,12....吧A5=16
An=4n-4（n为正整数）
如果N=1是一个情况 N>1是一个情况
第n个数(n-1)4 第5个是16
第5个是16咯，n个数是（n-1）×4
16咯，n个数是（n-1）×4
16
第n个数为4(n-1)
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