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A032320
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Doubles (index 2+) under "EGJ" (unordered, element, labeled) transform.
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0
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2, 2, 12, 126, 1800, 33540, 757680, 20149290, 616940520, 21378058800, 827126546400, 35346832387020, 1653593623521840, 84055016334088800, 4613207941230688800, 271883701342581277950
(list; graph; refs; listen; history; internal format)
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