# A141307 (b-file synthesized from sequence entry) 1 2 2 4 3 24 4 208 5 2272 6 29504 7 441216 8 7447808 9 139951616 10 2897228800 11 65533753344 12 1608679247872 13 42607095439360 14 1211489065582592 15 36818002833014784 16 1191230067009978368 17 40888060455008731136 18 1484180363633916903424 19 56809679459301490950144 20 2287045885619374501396480 21 96608773951155028111654912