# A301737 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 8 5 30 6 144 7 840 8 5760 9 45360 10 403200 11 570240 12 43545600 13 518918400 14 6706022400 15 93405312000 16 126804787200 17 22230464256000 18 53801459712000 19 6758061133824000 20 128047474114560000 21 2554547108585472000 22 53523844179886080000