# A073511 (b-file synthesized from sequence entry) 1 1 2 4 3 18 4 125 5 1027 6 8435 7 71564 8 622882 9 5516130 10 49495432 11 448855139 12 4106164356 13 37838546363 14 350849788546 15 3270531245684 16 30628143485953 17 287992070079777 18 2717649138419586 19 25726964404879666 20 244242934202964444 21 2324722877951987037 22 22178433287546997612