# A347856 (b-file synthesized from sequence entry) 0 1 1 20 2 990 3 56576 4 3432198 5 215147520 6 13768454700 7 893768826880 8 58626071754822 9 3876225891958784 10 257898242928604740 11 17245961314149335040 12 1158088115444301759900 13 78040346182201091555328