271176domain: NAppears in sequencesa(n) = floor( sqrt(2) * (3/2)^n ).at n=30A0333201/8 the number of (n+1)X5 0..3 arrays with all 2X2 subblock sums the same.at n=7A1840241/8 the number of (n+1)X9 0..3 arrays with all 2X2 subblock sums the same.at n=3A184028