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The sequence is formed from two interwoven series.

440, 216, 104, 48 ........Halve the number and subtract 4.

260, 128, 62, 29...........Halve the number and subtract 2.

The next number would be generated by the first series

48/2 = 24

24 - 4 = 20..........which is the next number.

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14y ago

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