“…An alternative way to specify the positions of the exiled queens is by the sequence {S c : c 0} (A275895), which indicates which row contains the queen in column c (this the electronic journal of combinatorics 22 (2015), #P00 is well-defined, thanks to Theorem 23 below). The initial values of S c are 0, 2, 4, 1, 3,8,10,12,14,5,7,18,6,21,9,24,26,28,30,11,13,34, . .…”