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A013991
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Edge-disjoint paths between opposite corners of 2 X n grid.
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0
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1, 1, 4, 16, 72, 335, 1562, 7273, 33850, 157534, 733148, 3412005, 15879172, 73900265, 343925312, 1600598044, 7449042040, 34667184251, 161338016046, 750852888177, 3494403076902, 16262643529850
(list; graph; refs; listen; history; internal format)
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