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I'm going with 30
1 + 2^2 + 3^2 + 4^2 = 30
1 + 4 + 9 + 16 = 30
30?
16 + 9 + 4 + 1 = 30
16+1+3+5 = 25
(without balls inside, hollow style)
16+1+3+(1)+5+(3) = 29
(With balls inside, solid style)
