# A027098 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 19 4 55 5 161 6 469 7 1362 8 3954 9 11483 10 33379 11 97146 12 283114 13 826214 14 2414366 15 7064217 16 20693797 17 60686847 18 178152055 19 523473326 20 1539479414 21 4531059224 22 13345835288 23 39335816471 24 116012701523 25 342356498884