# A084018 (b-file synthesized from sequence entry) 1 1 2 11 3 37 4 1001 5 10001 6 33517 7 157573 8 2637514 9 11118889 10 100080001 11 1819008182 12 17500275001 13 76944363077 14 1428575357143 15 33333336666667 16 131875027500007 17 588235715882353 18 11111111538888889 19 52631583252631579