A neural network has n layers, where the number of neurons in the ith layer is layer[i]. In each generation, the system adjusts the neurons as follows:

• In odd generations: 1 neuron can be added to at most one layer.
• In even generations: 2 neurons can be added to at most one layer. Find the minimum generation in which all layers can have an equal number of neurons.

The 6th generation is the minimum in which all the layers can have an equal number of layer, i.e., 4.