83492domain: NAppears in sequencesNumber of trisubstituted linear alkanes of composition C_n H_(2n-1) XYZ.at n=27A159941Number of (n+1) X 2 0..2 arrays with rows and columns in nondecreasing order and with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.at n=12A184073