140512

Appears in sequences

• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined below in Comments.at n=10A192383
• Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape U; triangle T(n,k), n>=0, read by rows.at n=31A247708
• Triangle of Arnold L(b) for Springer numbers.at n=42A256665