Infinite log-convexity of the Catalan-Larcombe-French transform sequence

Let {Vn}n0\{V_n\}_{n\geq 0} be the Fennessey-Larcombe-French sequence, and consider the sequence {Vn2Vn1Vn+1}n2\{V_n^2-V_{n-1}V_{n+1}\}_{n\geq 2}. Infinite log-convexity conjecture. The sequence {Vn2Vn1Vn+1}n2\{V_n^2-V_{n-1}V_{n+1}\}_{n\geq 2} is infinitely log-convex. This conjecture concerns higher-order log-convexity for a sequence related to the Catalan-Larcombe-French and Fennessey-Larcombe-French sequences. The source notes that Stieltjes moment sequences are infinitely log-convex, suggesting an analytic approach, but does not establish the conjecture.

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Primary source

Brian Y. Sun and James J. Y. Zhao, “Log-behavior of two sequences related to the elliptic integrals”, arXiv:1602.04359 (2017).

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