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A078262
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Sum of the forward and reverse concatenations of 1 to n.
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0
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2, 33, 444, 5555, 66666, 777777, 8888888, 99999999, 1111111110, 23333333231, 2345555545332, 244567776755433, 25466789897765534, 2647689001998775635, 274869910212099785736, 28497092031222200795837, 2950719304132232301805938
(list; graph; refs; listen; history; internal format)
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