# A177371 (b-file synthesized from sequence entry) 0 1 1 18 2 98 3 812 4 5748 5 43120 6 316600 7 2343120 8 17290256 9 127726400 10 943159584 11 6965532736 12 51439836352 13 379886330112 14 2805462584192 15 20718413985536 16 153005867110656 17 1129951564794880 18 8344715027364352 19 61625891492889600