68160

Appears in sequences

• Sum_{n >= 0} a(n) * x^n / n!^2 = exp(-2*x)/(1-x)^3.at n=5A052127
• a(n)=2a(n-1)+4a(n-2)-4a(n-3)-4a(n-4).at n=12A099177
• Numbers k such that the first 9 digits of the k-th Lucas number are 1-9 pandigital.at n=25A216489
• Number of (n+1) X (1+1) 0..2 arrays with no 2 X 2 subblock having its minimum diagonal element less than its minimum antidiagonal element.at n=4A250920
• Number of (n+1)X(5+1) 0..2 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element.at n=0A250924
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element.at n=10A250927
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element.at n=14A250927
• Expansion of 2*(1-x)*(2*x^2+4*x+1) / (1-x-x^2)^2.at n=16A271786
• a(n) is the number of 2 X 2 matrices over the integers mod n that are invertible mod n for every permutation of their elements.at n=19A367926
• E.g.f. A(x) satisfies A(x) = 1/( 1 - x * cosh(x * A(x)) )^2.at n=6A381377