# A005469 (b-file synthesized from sequence entry) 1 2 2 5 3 11 4 26 5 56 6 122 7 287 8 677 9 1457 10 3137 11 6833 12 14885 13 35015 14 82370 15 194300 16 458330 17 986390 18 2122850 19 4570610 20 9840770 21 21435122 22 46689890 23 101709206 24 221563226 25 521198276 26 1226050226 27 2884185551 28 6784816901 29 16004491001 30 37752490001 31 89053519001