# A148052 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 10 5 20 6 63 7 133 8 516 9 1218 10 4465 11 10703 12 44548 13 113711 14 450058 15 1153535 16 4996768 17 13352786 18 55352661 19 147886291 20 657261944 21 1810272037 22 7740475160 23 21274221703 24 96257801996 25 270869293600 26 1184198800343 27 3322353778443 28 15231848541136 29 43555542439718 30 193622102777095 31 551782565099753