4975179472domain: NAppears in sequencesNumber of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock singular.at n=3A184764Number of (n+1)X5 0..3 arrays with every 2X2 subblock singular.at n=3A184768T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock singular.at n=24A184773