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A331650
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Number of binary matrices with n distinct columns and any number of distinct nonzero rows with 4 ones in every column and columns in decreasing lexicographic order.
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2
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1, 0, 0, 840, 768785, 1493786233, 5254074934990, 29830719723310370, 255792964622656480490, 3156204819384156606884415, 53951801951854013864607338684, 1238521839654509818636854497532129, 37207357446549003419594083481144144755, 1431264458992614322596852782769837314471920
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OFFSET
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0,4
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COMMENTS
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The condition that the columns be in decreasing order is equivalent to considering nonequivalent matrices with distinct columns up to permutation of columns.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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