In this sequence there are actually two sequences. 1 sequence for the numbers in odd positions (1,3,5 enz) and one sequence for the numbers in the even positions (2,4,6 enz.) The following applies to the numbers in the odd positions:

In this sequence you find the next number by applying the following transformation: *4

VThe following applies to the numbers in the even positions:

In this sequence you find the next number by applying the following transformation: /7