# A112289 (b-file synthesized from sequence entry) 1 1 2 1 3 6 4 33 5 4200 6 4192200 7 1705200 8 77892963984 9 10086416728304192640 10 126556188275836361347200 11 451535899566923284351392000 12 1253032399528279799996000622278320876800