270333

Appears in sequences

• a(n) = Sum_{k=0,1,2,...,n-4,n-2,n-1} a(k); a(n-3) is not a summand, with a(0)=0, a(1)=1, a(2)=3.at n=21A049859
• Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.at n=2A203828
• Number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.at n=2A203830
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.at n=12A203835