73708domain: NAppears in sequencesCluster series for site percolation problem on square matching lattice (square lattice with 1st and 2nd neighbors connected).at n=9A003201Number of (n+4)X6 0..2 matrices with each 5X5 subblock idempotent.at n=9A224619a(n) = 144*2^n - 20 (n>=1).at n=8A304388