1772645420domain: NAppears in sequencesa(n) = binomial(5*n+3,n)/(n+1).at n=10A118971Number of 3-connected triangulations of a pentagon up to orientation-preserving isomorphisms with n interior nodes.at n=11A341925Number of achiral dissections of a polygon into n hexagons by nonintersecting diagonals rooted at a cell.at n=20A370061