# A074424 (b-file synthesized from sequence entry) 1 0 2 1 3 2 4 6 5 36 6 240 7 1296 8 6312 9 31824 10 165840 11 883872 12 4861056 13 27433728 14 155696585 15 878719104 16 4938274944 17 27770211072 18 156752183808 19 889181991936 20 5067822213734 21 28987320651922 22 166186204664832 23 954240788994048 24 5486884531697664 25 31596861676172076