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A032019
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Doubles (index 2+) under "AGJ" (ordered, elements, labeled) transform.
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0
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2, 4, 48, 1128, 34320, 1373520, 66662400, 3813742800, 251390391840, 18762435034560, 1564074260179200, 144043759065840480, 14524339063446051840, 1591480683038304938880
(list; graph; refs; listen; history; internal format)
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