488034

Appears in sequences

• Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.at n=9A259722
• a(n) = Sum_{k=0..floor(n/3)} binomial(4*n-3*k-3,n-3*k).at n=7A390708