53940782domain: NAppears in sequencesNumber of (n+1)X(n+1) 0..3 arrays with the upper median of every 2X2 subblock equal.at n=2A237068Number of (n+1)X(3+1) 0..3 arrays with the upper median of every 2X2 subblock equal.at n=2A237071T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median of every 2X2 subblock equal.at n=12A237076