43045

Appears in sequences

• Number of polyominoes with n cells that tile the plane isohedrally but not by translation or by 180-degree rotation (Conway criterion).at n=14A075204
• Numbers n such that 4*10^n + 2*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=12A102986
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.at n=15A123765
• Number of n X 2 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.at n=8A223927