23727920916domain: NAppears in sequencesSecond column of A027466.at n=11A027473Base-7 complementary numbers: n equals the product of the 7 complement (7-d) of its base-7 digits d.at n=21A298977Number of indecomposable closed walks of length 2n along the edges of a cube based at a vertex.at n=13A328778