783273204631domain: NAppears in sequences1/4 the number of (n+1) X 3 0..3 arrays with every 2 X 2 subblock having at least two equal elements connected horizontally or vertically.at n=6A1841461/4 the number of (n+1)X8 0..3 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically.at n=1A184151