# A049952 (b-file synthesized from sequence entry) 1 1 2 2 3 2 4 6 5 13 6 25 7 51 8 113 9 264 10 478 11 957 12 1925 13 3888 14 7989 15 16671 16 36273 17 85329 18 153988 19 307977 20 615965 21 1231968 22 2464149 23 4928991 24 9860913 25 19734609 26 39537876 27 79298400 28 159520791 29 322738605 30 660282828 31 1380129447 32 3003699099