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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8
216. It's the cube of 6.
27= 3364=43125=53so next number will be 63 = 216
There is only one number that equals 216. That number is . . . . . 216.
8, the series is of the form 1^8, 2^7, 3^6 and so on