G, J, T, J, J, J, A, M, W, J, J, Z, M, F, J, ?

series/series.03a

Problem

G, J, T, J, J, J, A, M, W, J, J, Z, M, F, J, ?

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G, J, T, J, J, J, A, M, W, J, J, Z, M, F, J, A.  US Presidents' first names.