# A294832 (b-file synthesized from sequence entry) 0 4 1 36 2 252 3 1197 4 47880 5 1388520 6 23604840 7 153431460 8 843873030 9 2953555605 10 17721333630 11 2091117368340 12 33457877893440 13 769531191549120 14 28472654087317440 15 2249339672898077760 16 2249339672898077760 17 200191230887928920640 18 9408987851732659270080 19 1881797570346531854016