# A122439 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 12 4 25 5 54 6 113 7 232 8 477 9 970 10 1965 11 3972 12 8001 13 16094 14 32329 15 64864 16 130053 17 260594 18 521925 19 1044988 20 2091689 21 4185990 22 8375969 23 16757976 24 33525165 25 67064346 26 134149981 27 268332404 28 536714129 29 1073503278 30 2147120761