# A124536 (b-file synthesized from sequence entry) 0 1 1 1 2 7 3 49 4 343 5 2401 6 9430 7 65810 8 480077 9 3637345 10 28502254 11 230271472 12 1913354190 13 16318251874 14 142611810220 15 1275372111383 16 11657396456231 17 108792892306605 18 1035708759921763 19 10049835806235885 20 99321845447658052