| 数据
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1, 2, 4, 5,78,910, 11,1413,1516, 17, 19, 21,2324, 25, 27,2930, 31,34,3335,3637,3839, 41, 43,4546,4748, 49, 51, 53,5556,57,59,61,63,65,67,69,71,73,75,77,7978,8180,8382,8584, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107,109108, 111,113112,115114, 117, 119, 121, 123, 125,127,129
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| 例子
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A131394号= (0,1,2,-1,3,6,-7,5,-3,7,...). 去掉首字母0得到(1,2,-1,3,6,-7,5,6,-3,7,…),并注意(1,2,3,4,…)占据位置1,2,4,7,。。。,(如中所示A131396号)(-1,-2,-3,…)占据位置3,6,8,。。。(如中所示A131397号).
中出现的第五个正整数A131393号为6,出现在位置9,因此a(5)=9-1=8。
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