19855042560domain: NAppears in sequences1/32 the number of (2n+1) X 6 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.at n=2A1837681/32 the number of (n+1) X 7 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.at n=4A183769