# A361533 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 1 4 4 5 20 6 130 7 980 8 8400 9 80920 10 865200 11 10164000 12 130114600 13 1802600800 14 26867640800 15 428661633400 16 7288513232000 17 131558835408000 18 2512282795422400 19 50600743739145600 20 1071998968264224000 21 23829055696093648000 22 554524256514356128000