886707domain: NAppears in sequencesNumber of (n+2)X5 0..2 matrices with each 3X3 subblock having the same population.at n=2A224656T(n,k)=Number of (n+2)X(k+2) 0..2 matrices with each 3X3 subblock having the same population.at n=12A224658G.f.: Sum_{n>=0} 3^n * ((1+x)^n - 1)^n.at n=5A301582