93847domain: NAppears in sequencesSecond entry in row n of triangle in A169950.at n=34A169952Number of (n+2)X(1+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..1+2} equal, and every column sum{i*x(i,j), i=1..n+2} equal, with upper left element zero.at n=21A232648