In 1945, the FCC decided to move the 42-50 Mcs Original FM Radio Band to 88-106 Mcs  (later 88-108 MHz). 

Because FM broadcasting would be vacating 42-50 Mcs, TV Channel 1 was moved down to 44-50 Mcs in the old FM band.  The TV & FM Radio Allocations which went into effect on February 25, 1946 (mybd), were as follows:
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New FM radio band:  88-106 Mcs

Channel 1  44 - 50 Mcs
Channel 2  54-60 Mcs 
Channel 3  60-66 Mcs
Channel 4  66-72 Mcs 
Channel 5  76-82 Mcs 
Channel 6  82-88 Mcs
Channels 7-13 as presently assigned

Although several television stations were scheduled to move to to the new Channel 1, no TV stations ever broadcast on 44 - 50 Mcs.  

It could not be used immediately because it was necessary for all existing FM stations to move out of the 42-50 Mcs spectrum to the 88-106 Mcs FM Band.  

When all the FM stations finally did move, the FCC decided to re-allocate 44 - 50 Mcs to other services.   Thus, Channel 1 disappeared.

There was no renumbering of the remaining channels.