ζ({{2}^m, 1, {2}^m, 3}^n, {2}^m) / π^{4n + 2m(2n+1)} is rational

The cyclic insertion conjecture of Borwein, Bradley, Broadhurst and Lisoněk states that inserting all cyclic shifts of some fixed blocks of 2's into the multiple zeta value ζ(1,3,...,1,3) gives an explicit rational multiple of a power of π. In this paper we use motivic multiple zeta values to establish a non-explicit symmetric insertion result: inserting all possible permutations of some fixed blocks of 2's into ζ(1,3,...,1,3) gives some rational multiple of a power of π.

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