# A047031 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 5 4 9 5 18 6 32 7 63 8 124 9 245 10 490 11 964 12 1923 13 3835 14 7652 15 15304 16 30504 17 60973 18 121866 19 243596 20 487192 21 973568 22 1946851 23 3893037 24 7784919 25 15569838 26 31132592 27 62262654 28 124519328 29 249028126 30 498056252 31 996046984 32 1992070217