# A027819 (b-file synthesized from sequence entry) 1 7 2 84 3 504 4 2100 5 6930 6 19404 7 48048 8 108108 9 225225 10 440440 11 816816 12 1447992 13 2469012 14 4069800 15 6511680 16 10147368 17 15444891 18 23015916 19 33649000 20 48348300 21 68378310 22 95315220 23 131105520 24 178132500 25 239291325 26 318073392 27 418660704 28 546031024 29 706074600 30 905723280