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A190917
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Number of permutations of n copies of 1..3 introduced in order 1..3 with no element equal to another within a distance of 1
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2
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1, 5, 29, 182, 1198, 8142, 56620, 400598, 2872754, 20824778, 152303410, 1122149800, 8319825040, 62017475600, 464452683432, 3492568119566, 26358270711370, 199565061455634, 1515311001158482, 11535716330003876, 88025068713285476
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