求数列an的通项公式有哪些方法?

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select * from tbl_Articles WHERE ArticleID=2869601 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1108624,1114112,1107827,1101741,984588,1065669,1050529,1104828,1080415,1052747,1126180,1049964,1031233,1117554,1115410,1114404,1126656,1076239,1092770,1081069,1042446,990808,1114362,1066628,1116105,1112412,1118617,1275997,1106455,1118837) ORDER BY field (ArticleID,1108624,1114112,1107827,1101741,984588,1065669,1050529,1104828,1080415,1052747,1126180,1049964,1031233,1117554,1115410,1114404,1126656,1076239,1092770,1081069,1042446,990808,1114362,1066628,1116105,1112412,1118617,1275997,1106455,1118837)