# A373715 (b-file synthesized from sequence entry) 0 1 1 6 2 42 3 284 4 1938 5 13188 6 89828 7 611640 8 4165218 9 28363252 10 193145388 11 1315249800 12 8956413716 13 60990068520 14 415321615368 15 2828197518960 16 19259058052098 17 131147584691796 18 893070155862492 19 6081501856336488 20 41412945154765212 21 282007973308889592