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A357140
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Number of n X n triangular (0,1)-matrices with exactly 2n entries equal to 1 and no zero rows or columns.
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1
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1, 0, 0, 1, 26, 865, 39268, 2375965, 185974145, 18337523130, 2227232055239, 327003956573263, 57121908284696448, 11712143532463633752, 2786114854266411595229, 761208643373263480081077, 236761580851204534640426709, 83183218467008383189955036015
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OFFSET
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0,5
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LINKS
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FORMULA
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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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