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EXAMPLE
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a(4) = 10: {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}, {13,14,15,16}},
{{1,3,5,7}, {2,4,6,8}, {9,10,11,12}, {13,14,15,16}},
{{1,2,3,4}, {5,7,9,11}, {6,8,10,12}, {13,14,15,16}},
{{1,4,7,10}, {2,5,8,11}, {3,6,9,12}, {13,14,15,16}},
{{1,2,3,4}, {5,6,7,8}, {9,11,13,15}, {10,12,14,16}},
{{1,3,5,7}, {2,4,6,8}, {9,11,13,15}, {10,12,14,16}},
{{2,4,6,8}, {1,5,9,13}, {3,7,11,15}, {10,12,14,16}},
{{1,2,3,4}, {5,8,11,14}, {6,9,12,15}, {7,10,13,16}},
{{1,3,5,7}, {2,6,10,14}, {9,11,13,15}, {4,8,12,16}},
{{1,5,9,13}, {2,6,10,14}, {3,7,11,15}, {4,8,12,16}}.
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