4
{1, 2} | {2, 4} | | {3, 2} |(total: 3)
{1, 2, 4} | {1, 3, 2} } | | {3, 1, 2} | | {3, 2, 4} | {4, 1, 2} ... (total: 5)
{1, 3, 2, 4} | {1, 4, 3, 2} | | {3, 1, 2, 4} | | {3, 4, 1, 2} | | {4, 1, 3, 2} | ... (total: 5)
1 + 3 + 5 + 5=14 I get 14 integers divisible by 4