# A019253 (b-file synthesized from sequence entry) 3 0 4 1 5 5 6 5 7 4 8 18 9 28 10 60 11 212 12 460 13 1043 14 2759 15 6719 16 16423 17 41936 18 105230 19 263127 20 664923 21 1686353 22 4297625 23 11021275 24 28308885 25 72818850 26 187867422 27 486098774 28 1261423934 29 3283684880 30 8571922494 31 22429169793