# A173399 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 35 4 390 5 7332 6 216859 7 9752100 8 652531454 9 63912820877 10 9040966693920 11 1825887005430112 12 521181458071204133 13 208402575114740157174 14 115825454552169007964634 15 88852094573138413500449755 16 93499965506283177978710943850 17 134231450058844163850300579669696 18 261626767193693218968916427480786899