29254domain: NAppears in sequencesNumber of (n+4)X(n+4) 0..2 matrices with each 5X5 subblock idempotent.at n=3A224617Number of (n+4) X 8 0..2 matrices with each 5 X 5 subblock idempotent.at n=3A224621T(n,k)=Number of (n+4)X(k+4) 0..2 matrices with each 5X5 subblock idempotent.at n=24A224625