53481domain: NAppears in sequencesa(n) = (n+2)*Catalan(n) - 1.at n=9A000777Expansion of 1/((1-x)(1-2x)(1-9x)(1-10x)).at n=4A021284Number of tilings of a 14 X n rectangle using 2n heptominoes of shape I.at n=24A250664Number of compositions of n whose run-lengths are either weakly increasing or weakly decreasing.at n=19A332835