215160

Appears in sequences

• Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001.at n=7A260542
• a(n) = Sum_{k=0..floor(n/2)} binomial(n+k-1,k) * binomial(n+3*k-1,n-2*k).at n=9A387617