# A056347 (b-file synthesized from sequence entry) 1 6 2 15 3 50 4 210 5 882 6 4220 7 20640 8 107100 9 563730 10 3036411 11 16514100 12 90778485 13 502474350 14 2799199380 15 15673672238 16 88162569180 17 497847963690 18 2821127257950 19 16035812864940 20 91404065292036