74482domain: NAppears in sequencesNumber of plane regions after drawing (in general position) a convex n-gon and all its diagonals.at n=36A027927Pentagonal numbers (A000326) whose digit reversal is a prime.at n=28A1157071/16 the number of (n+1) X (n+1) 0..3 arrays with all 2 X 2 subblocks having the same four values.at n=12A184030