# A162755 (b-file synthesized from sequence entry) 0 1 1 9 2 72 3 540 4 4032 5 29988 6 223020 7 1658160 8 12328596 9 91662732 10 681510816 11 5067014148 12 37673118252 13 280098623952 14 2082525799284 15 15483523651596 16 115119584685504 17 855911035979748 18 6363675682412076 19 47313758657548656 20 351776531372292180 21 2615449111101347724 22 19445794254904116960