It could be 34, if you use the position to value rule
Un = (-9n4 + 106n3 - 429n2 + 692n - 348)/12 for n = 1, 2, 3, ...
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4
This series is of the function f(x) = x2+1, starting with x=0.The next number in the series is 26. The number after that is 37.
1204
20
4