To use or not to use complement?

How many ways are there to choose 6 integers from 1 to 50 so that none of them are the same and none of them are consecutive to each other?

For example, (1,2,5,7,10,13) is not allowed because 1 and 2 are consecutive.

(1,3,5,7,9,11) and (1,5,3,7,11,9) counts as one way.

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