What is the rule foe this pattern 4 8 61 221 244 884?

Answer 1

The pattern is that each progressive number is multiplied by 2 and then the digits are reversed.

2 x 4 = 8 → 8 (no change as only 1 digit)

2 x 8 = 16 → 61

2 x 61 = 122 → 221

2 x 221 = 442 → 244

2 x 244 = 488 → 884

Answer 2

1768