305789domain: NAppears in sequencesf-vectors for simplicial complexes of dimension at most 2 on at most n-1 vertices.at n=20A011827Spiral on a 2D square lattice, one term per cell, starting at the origin with 0; the four integers forming any 2 X 2 square have all digits 0 through 9 (with duplicate digits allowed).at n=52A337368