593589domain: NAppears in sequencesNumber of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.at n=11A123797Values tilde(B_s(2)) of q-analogs of Fibonacci numbers.at n=16A279007