# A049939 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 5 5 14 6 24 7 52 8 123 9 345 10 568 11 1140 12 2299 13 4697 14 9839 15 21409 16 50358 17 141235 18 232113 19 464230 20 928479 21 1857057 22 3714559 23 7430849 24 14869238 25 29778995 26 59739745 27 120175856 28 243137792 29 497430263 30 1039731033 31 2262860113