# A016218 (b-file synthesized from sequence entry) 0 1 1 10 2 71 3 440 4 2541 5 14070 6 75811 7 400900 8 2091881 9 10808930 10 55442751 11 282806160 12 1436400421 13 7271480590 14 36715316891 15 185008240220 16 930767824161 17 4676745613050 18 23475354034231 19 117743274047080 20 590182385739101 21 2956775990710310 22 14807336201610771