# A027977 (b-file synthesized from sequence entry) 0 1 1 3 2 4 3 8 4 15 5 28 6 54 7 101 8 199 9 373 10 743 11 1404 12 2801 13 5353 14 10636 15 20495 16 40615 17 78753 18 155793 19 303553 20 599801 21 1173183 22 2316317 23 4544731 24 8968421 25 17641499 26 34801731 27 68602923 28 135308317 29 267203186 30 526966454 31 1042217402