259808

Appears in sequences

• a(n) = a(n-1) + (3+(-1)^n)*a(n-2)/2.at n=20A007068
• a(n) = 4*a(n-1) - 2*a(n-2) with a(0) = 1, a(1) = 4.at n=10A007070
• Coordination sequence for C_4 lattice.at n=23A019560
• a(0)=0; a(1)=1; a(n) = a(n-1) + (3 + (-1)^n)*a(n-2)/2.at n=22A062112
• Number of n step walks (each step +/-1 starting from 0) which are never more than 3 or less than -3.at n=20A068912
• Coefficient of x^2 in (1+x)^n mod 1+x^4.at n=22A099588
• Coefficient of x^2 in (1+x)^n mod 1+x^4.at n=23A099588
• a(n) = 4*a(n-2) - 2*a(n-4).at n=22A121720
• The number of 1 by n Haunted Mirror Maze puzzles with a unique solution ending with a mirror, where mirror orientation is fixed.at n=11A204089
• Number of (n+2) X (n+2) 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=2A204390
• Number of (n+2)X5 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=2A204393
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=12A204398
• Expansion of (1+2*x-x^3)/(1-4*x^2+2*x^4).at n=20A217730