# A371117 (b-file synthesized from sequence entry) 0 1 1 0 2 2 3 3 4 32 5 210 6 2184 7 26460 8 373344 9 6150816 10 113958720 11 2362345920 12 54094694400 13 1355708296800 14 36926213869440 15 1085886303989760 16 34291129916574720 17 1157362522046277120 18 41576054625791078400 19 1583864892141097098240 20 63779322541075124428800