132079domain: NAppears in sequencesNumbers k such that k, k+2, k+4, k+6, k+8, k+10, k+12 are semiprimes.at n=11A092129Number of vertices in a graph of n adjacent rectangles in a row with all possible diagonals drawn, as in A306302, but without the rectangles' edges which are perpendicular to the row.at n=31A369176