# A049970 (b-file synthesized from sequence entry) 1 1 2 3 3 2 4 7 5 16 6 30 7 62 8 123 9 251 10 496 11 994 12 1987 13 3979 14 7967 15 15948 16 31928 17 63917 18 127712 19 255426 20 510851 21 1021707 22 2043423 23 4086860 24 8173752 25 16347565 26 32695258 27 65390761 28 130782020 29 261565033 30 523132058 31 1046268104 32 2092544189