425384

Appears in sequences

• G.f. satisfies: A(x) = (1+y)*A(y^2) where y = x*A(x).at n=12A145072
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical or antidiagonal neighbor, and containing the value n(n+1)/2-5.at n=4A211927
• T(n,k)=Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical or antidiagonal neighbor, and containing the value n(n+1)/2-k-1.at n=32A211930