# A325995 (b-file synthesized from sequence entry) 0 1 1 2 2 10 3 66 4 920 5 16210 6 429672 7 13872026 8 567140800 9 27659216034 10 1597736349560 11 107173173825322 12 8248047045580608 13 720418094750908658 14 70754645379708307864 15 7752521231225769465210 16 941123321624950265044352 17 125814927060189222097127746 18 18423275946242027309159243256 19 2940809638786511819597887208906 20 509519998644880962798618701505280 21 95446391880475967165359534058573202