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Part (i) of Ishikawa and Koutschan's Pfaffian conjecture is false as printed

At k = n = 2 the Pfaffian of the matrix of the second column of the Motzkin triangle is -8, while the printed product in part (i) of Ishikawa and Koutschan's Conjecture conj.gen is 8.

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THEOREM

A sign counterexample at k = n = 2

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Part (i) of Ishikawa and Koutschan's Pfaffian conjecture is false as printedPart (i) of Ishikawa andKoutschan's Pfaffian conjectureis false as printed
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Closed
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0
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D5/S0
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Certificates
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D5/S0/Certificates/IshikawaKoutschanMotzkinPfaffianRefutation
Repository path
D5/S0/Certificates/IshikawaKoutschanMotzkinPfaffianRefutation.lean
Truth release
sha256:76a8db6a0f78609b1b9d4a959c8392f2752f2daaddc1930e046e34ce07d0f608
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b52262a023c4db9bb30a128ebfd80ea4ef4c1a53
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37a24ddf3b9983bdabf0acbfd9b32b06c35c28d3

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Dependency edges, status, and source coordinates come from the verified release and certified topology. Blueprint exposition is labeled separately. A fallback title carries no additional mathematical authority.