1926378146domain: NAppears in sequencesNumber of (n+2)X(n+2) binary arrays with each 3X3 subblock singular.at n=3A186043Number of (n+2)X6 binary arrays with each 3X3 subblock singular.at n=3A186047T(n,k)=Number of (n+2)X(k+2) binary arrays with each 3X3 subblock singular.at n=24A186052