8713232domain: NAppears in sequencesNumber of rooted planar maps with 4 faces and n vertices and no isthmuses.at n=30A006468Number of (n+1) X 2 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively.at n=28A204644