# A074445 (b-file synthesized from sequence entry) 1 0 2 0 3 2 4 12 5 60 6 300 7 1296 8 5616 9 28080 10 155520 11 883872 12 5018112 13 28304640 14 158130514 15 878719104 16 4899999744 17 27554100480 18 156139902720 19 889181991936 20 5077739844402 21 29043991855542 22 166348496793600 23 954240788994048 24 5484206701412352 25 31581437286776820