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A121785
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"Spanning walks" on the square lattice (see Jensen web site for further information).
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2
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8, 95, 2320, 154259, 30549774, 17777600753, 30283708455564, 152480475641255213, 2287842813828061810244, 102744826737618542833764649, 13848270995235582268846758977770
(list; graph; refs; listen; history; internal format)
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