137613

Appears in sequences

• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4 which is symmetric after a rotation by 180 degrees.at n=6A123839
• Expansion of 1/(1-x-x^2-x^3-x^4+x^5+x^6+x^7-x^9).at n=20A258000