# A052865 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 18 4 166 5 1720 6 20168 7 265776 8 3900048 9 63160944 10 1119902112 11 21588456912 12 449695165104 13 10068121989120 14 241142216363904 15 6153066311872128 16 166649425520796288 17 4775084999073669888 18 144324648624594398976 19 4589066547251186277888