# A212443 (b-file synthesized from sequence entry) 1 4 2 16 3 64 4 280 5 1344 6 6496 7 32640 8 166320 9 862400 10 4523232 11 23970240 12 128063040 13 689008320 14 3728973120 15 20285199872 16 110841302880 17 608029121280 18 3346972244000 19 18480871268160 20 102328688556864 21 568014587806720 22 3160148362953120 23 17617881702072960