# A307576 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 5 5 11 6 26 7 65 8 164 9 421 10 1101 11 2912 12 7777 13 20957 14 56891 15 155418 16 426975 17 1178841 18 3269023 19 9101182 20 25428895 21 71279177 22 200391716 23 564899237 24 1596399798 25 4521769035 26 12835037619 27 36504130056 28 104012102095 29 296872273835 30 848694416554 31 2429884047993