# A052729 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 12 4 168 5 3120 6 75600 7 2237760 8 78382080 9 3169393920 10 145297152000 11 7446479040000 12 421880659200000 13 26181558769766400 14 1766275594501017600 15 128700516232544256000 16 10073126652104355840000