# A148465 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 19 5 61 6 216 7 789 8 2960 9 11439 10 45114 11 180779 12 735676 13 3030120 14 12613335 15 53004791 16 224550436 17 958227715 18 4115750849 19 17780103175 20 77214818728 21 336921319180 22 1476478558914 23 6495954222412 24 28683344656932 25 127075652153227 26 564718190262450 27 2516734088100503 28 11245821481990912