# A149753 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 17 4 83 5 321 6 1591 7 6703 8 33373 9 147727 10 736945 11 3364931 12 16801887 13 78306089 14 391203703 15 1849547589 16 9242836257 17 44158627031 18 220716999275 19 1062867840851 20 5313123521945 21 25742526291623 22 128692783682713 23 626548287495809 24 3132411437550179 25 15309626547447817 26 76542561918362105