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EXAMPLE
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a(7) = 60 since all right-crucial permutations with respect to squares of length 7 are 2136547, 2137546, 2146537, 2147536, 2156437, 2157436, 2167435, 3146527, 3147526, 3156427, 3157426, 3167425, 3246517, 3247516, 3256417, 3257416, 3267415, 3421675, 3521674, 3621574, 3721564, 4156327, 4157326, 4167325, 4256317, 4257316, 4267315, 4356217, 4357216, 4367215, 4521673, 4531672, 4532671, 4621573, 4631572, 4632571, 4721563, 4731562, 4732561, 5167324, 5267314, 5367214, 5467213, 5621473, 5631472, 5632471, 5641372, 5642371, 5721463, 5731462, 5732461, 5741362, 5742361, 6721453, 6731452, 6732451, 6741352, 6742351, 6751342, 6752341.
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