209091

Appears in sequences

• Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,2,0,1,4 for x=0,1,2,3,4.at n=10A196584
• a(0) = 1; a(n) = Sum_{k=0..n} k * binomial(4*n-2*k,n-k)/(2*n-k).at n=8A390713