Determine the explicit formula for the nth term of the sequence: 14, 13, 25, 49, 817, 1633,...
a) aₙ = 14 * 2ⁿ⁻¹ - 1
b) aₙ = 2ⁿ + n + 11
c) aₙ = 2ⁿ - n - 1
d) aₙ = 14 * 2ⁿ⁻¹ + n