You must mean what is the next number in the series, not the 'nth', which is undefined. The next number is 58.
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The nth term is (36 - 4n)
72/2n
Formula for nth termTn = a + (4n - 1) {where a is the first term and n is natural number}
square of (n x 2)
T(n) = 9 x 2(n-1)