211548

Appears in sequences

• Number of n X n 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.at n=2A206894
• Number of nX3 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.at n=2A206895
• T(n,k)=Number of nXk 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.at n=12A206900
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+4*k-1,n-k).at n=7A389323