self Maths Puzzle

6,20,72,110,210,___

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its answer is 272 as according to the pattern,
2^2 +2,4^2+4,8^2+8,10^2+10,14^2+14 so in this way the next no will be 16^2+16(Since 2 and 4 are alternately being added in the series so 14+2=16)
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