372436

Appears in sequences

• Number of self-inverse permutations p on [n] with displacement of elements restricted by 9: |p(i)-i| <= 9.at n=13A239081
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of sqrt((1+(k-4)*x+sqrt(1-2*(k+4)*x+((k-4)*x)^2)) / (2 * (1-2*(k+4)*x+((k-4)*x)^2))).at n=42A337389
• Expansion of sqrt((1-2*x+sqrt(1-12*x+4*x^2)) / (2 * (1-12*x+4*x^2))).at n=6A337390