228984

Appears in sequences

• a(n) = coefficient of x^n in the (n+1)-th iteration of (x + x^2 + x^3) for n>=1.at n=6A166883
• Number T(n,m) of ways of 4-coloring an n X m grid so that there is no rectangle with all 4 corners the same color.at n=5A200045
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+329)^2 = y^2.at n=36A205672
• 1/4 the number of n X n 0..3 symmetric matrices with every element equal to two or three horizontal and vertical neighbors.at n=7A211083
• Number of (n+1)X(n+1) -11..11 symmetric matrices with every 2X2 subblock having sum zero and three or four distinct values.at n=3A211716
• Number of ways of n-coloring the square grid graph G_(3,3) such that no rectangle exists with sides parallel to the axes having all 4 corners of the same color.at n=4A252778