# A375489 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 48 4 384 5 384 6 4608 7 64512 8 1032192 9 18579456 10 37158912 11 817496064 12 19619905536 13 510117543936 14 14283291230208 15 42849873690624 16 1371195958099968 17 46620662575398912 18 1678343852714360832 19 63777066403145711616 20 255108265612582846464 21 10714547155728479551488