# A073720 (b-file synthesized from sequence entry) 1 1 2 11 3 58 4 293 5 1468 6 7343 7 36718 8 183593 9 917968 10 4589843 11 22949218 12 114746093 13 573730468 14 2868652343 15 14343261718 16 71716308593 17 358581542968 18 1792907714843 19 8964538574218 20 44822692871093 21 224113464355468