# A141146 (b-file synthesized from sequence entry) 1 0 2 2 3 14 4 96 5 664 6 4660 7 33144 8 238448 9 1732112 10 12685428 11 93552700 12 694072720 13 5176136640 14 38777105120 15 291661779920 16 2201518518240 17 16670124621472 18 126586920736564 19 963723103197516 20 7354034055776864 21 56236603567496720