# A057220 (b-file synthesized from sequence entry) 1 2 2 4 3 6 4 8 5 12 6 14 7 18 8 36 9 68 10 152 11 212 12 324 13 1434 14 1592 15 1668 16 3338 17 7908 18 9662 19 27968 20 28116 21 33974 22 41774 23 66804 24 144518 25 162954 26 241032 27 366218 28 676592 29 991968