# A371140 (b-file synthesized from sequence entry) 0 1 1 0 2 2 3 3 4 56 5 270 6 5064 7 47040 8 984416 9 14116032 10 336538080 11 6589416240 12 179336461248 13 4446985514400 14 137520942168960 15 4112410749501600 16 143445512622458880 17 5004065722611594240 18 195260931334478223360 19 7762385328551718796800 20 336051947630616458065920