Conjecture identifying a Hankel transform with the Robbins numbers

From papers

Let A~(x)\tilde{A}(x) be the generating function constructed from the revert transform of the Fibonacci numbers as in the source, and consider the generating function

A~(ix)=11+x21x21+ixx21+ixx21+ix.\tilde{A}(ix)=\cfrac{1}{1+\cfrac{x^2}{1-\cfrac{x^2}{1+ix-\cfrac{x^2}{1+ix-\cfrac{x^2}{1+ix-\cdots}}}}}.

Its revert transform begins

1,0,1,0,3,i,12,11i,51,89i,204,628i,646,.1,0,1,0,3,-i,12,-11i,51,-89i,204,-628i,646,\ldots.

Robbins-number conjecture. The Hankel transform of this revert transform is the Robbins number sequence

1,1,2,7,42,429,7436,.1,1,2,7,42,429,7436,\ldots.

The claim is presented as a conjecture connecting a continued-fraction generating function and the Robbins numbers; the source gives no resolution.

Progress summary

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Sources & referencesView supporting material

Primary source

Paul Barry, “Centered polygon numbers, heptagons and nonagons, and the Robbins numbers”, arXiv:2104.01644 (2021).

Solutions 0

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